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  • 1.
    Anderhag, Per
    Stockholms universitet, Lärarhögskolan i Stockholm (LHS), Institutionen för undervisningsprocesser, kommunikation och lärande (UKL).
    Den svårformulerade evolutionen: gränssnittets och innehållets betydelse för de meningar om evolutionen som erbjuds användaren av tre digitala läromedel i biologi2003Licentiatavhandling, monografi (Övrigt vetenskapligt)
  • 2.
    Anderhag, Per
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för matematikämnets och naturvetenskapsämnenas didaktik.
    Taste for Science: How can teaching make a difference for students’ interest in science?2014Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    The objective of the thesis is to describe and analyse aspects of home background and teaching that may be important for students’ capability and will to participate in science. The purpose is to make explicit how teaching can support students in developing an interest in science and so counter-balance the restricted opportunities some students may have due to upbringing. In study 1 population data is used to make evident what associations there are between home background variables and the students’ choice of applying for the Swedish post-compulsory Natural Science Programme (NSP). The findings show that home background is important for Swedish students’ choice of the NSP but also that some lower secondary schools can make a difference. Students’ interest in science has usually been examined through questionnaires and rarely studied as constituted in classroom action as a result of teaching. In study 2 therefore an action-oriented methodology is developed based on the concept of taste to study what difference a teacher can make for the constitution of interest in the science classroom. The concept of taste is grounded in pragmatism and the works of Pierre Bourdieu and acknowledges the affective, normative, and cognitive dimensions of situated science learning. In study 3 this methodology is used to examine how a teacher located through Study 1 supports his students in developing an interest in science. The results of study 3 suggest how teaching can make the object of science the focus of students’ interest and so showing that science, with its aims, norms, and values, can be enjoyed in itself. Study 4 draws on the findings of studies 1-3 to discuss the possibility of an overlooked field in studying interest in science; namely whether primary, secondary, tertiary students in effect have different objects of interest. The findings of studies 1-4 are used to discuss how teaching may make a difference to a continued student interest in science.

  • 3.
    Anderhag, Per
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för matematikämnets och naturvetenskapsämnenas didaktik.
    Danielsson Thorell, Helena
    Andersson, Carina
    Holst, Andreas
    Nordling, Johan
    Syften och tillfälligheter i högstadie- och gymnasielaborationen: en studie om hur elever handlar i relation till aktivitetens mål2014Ingår i: NorDiNa: Nordic Studies in Science Education, ISSN 1504-4556, E-ISSN 1894-1257, Vol. 10, nr 1, s. 63-76Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Purposes and contingencies in the lower and upper secondary school lab

    Studies have shown that students’ awareness of the goals and purposes of the laboratory activity is important for their possibility to participate in and learn from the activity. While practical activities often have been considered to be a central part of science education, relatively few studies have examined laboratory work in situ. In this paper we addressed these issues by examining (a) what purposes are distinguished when students’ work with a laboratory assignment and (b) how these purposes are made continuous with the teacher’s aim with the assignment. The data was based on classroom observations from two ordinary laboratory settings, one from a chemistry class in lower secondary school and one from a physics class in the natural science programme in upper secondary school. Although both student groups acknowledged their teacher’s intentions with the practical and could act towards the more student centered purposes of the activity, e.g. describe what happens with the copper and measure the speed of a small vessel respectively, there were differences regarding the possibilities the students had to act toward the activity’s final aim. The results showed that these factors can be referred to the amount of purposes introduced by the teacher as well as those that arose because of contingences, and the connection of these purposes to students’ prior experiences.

  • 4.
    Anderhag, Per
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för matematikämnets och naturvetenskapsämnenas didaktik.
    Emanuelsson, Patrik
    Stockholms universitet, Naturvetenskapliga fakulteten, Matematiska institutionen.
    Wickman, Per-Olof
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för matematikämnets och naturvetenskapsämnenas didaktik.
    Hamza, Karim Mikael
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för matematikämnets och naturvetenskapsämnenas didaktik.
    Students' choice of post-compulsory science: In search of schools that compensate for the socio-economic background of their students2013Ingår i: International Journal of Science Education, ISSN 0950-0693, E-ISSN 1464-5289, Vol. 35, nr 18, s. 3141-3160Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    It is commonly argued that socio-economic inequalities can explain many of the differences in achievement and participation in science education that have been reported among countries and among schools within a country. We addressed this issue by examining (a) the relationship between variables associated with socio-economic background and application frequencies to the Swedish Natural Science Programme (NSP) in upper secondary school and (b) whether there are lower secondary schools in Sweden that seem to compensate for these variables. Data from Statistics Sweden (SCB) covering the whole population of 106,483 ninth-grade students were used to calculate the probability for each student to apply to the NSP. Our results indicate that the variables, such as parental educational level and grades, have explanatory power, but with varying effect for different subpopulations of students. For example, grades in mathematics have a greater impact than grades in science for females’ choice of the NSP. The opposite holds for male students. Out of 1,342 schools, 158 deviated significantly from predicted, that is, the students in these schools applied to the NSP in greater or lesser extent than expected. The number of deviating schools is greater than predicted by pure random variation. This suggests that variables of socio-economic background are only a partial explanation of the application frequencies, and that the deviation needs to be investigated further. Our findings suggest that in order to understand why schools deviate positively and so compensate for the socio-economic background of their students, we need to study their practices more closely

  • 5.
    Anderhag, Per
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för matematikämnets och naturvetenskapsämnenas didaktik.
    Hamza, Karim Mikael
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för matematikämnets och naturvetenskapsämnenas didaktik.
    Wickman, Per-Olof
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för matematikämnets och naturvetenskapsämnenas didaktik.
    What can a teacher do to support students’ interest in science?: A study of the constitution of taste in a science classroom2015Ingår i: Research in science education, ISSN 0157-244X, E-ISSN 1573-1898, Vol. 45, nr 5, s. 749-784Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this study, we examined how a teacher may make a difference to the way interest develops in a science classroom, especially for students from disadvantaged socioeconomic backgrounds. We adopted a methodology based on the concept of taste for science drawing on the work of John Dewey and Pierre Bourdieu. We investigated through transcripts from video recordings how such a taste is socially constituted in a 9th grade (ages 15–16) science classroom, where there was evidence that the teacher was making a positive difference to students’ post-compulsory school choice with regard to science. Salient findings regarding how this teacher supported students’ interest are summarized. For example, the teacher consistently followed up how the students acknowledged and enjoyed purposes, norms, and values of the science practice and so ensuing that they could participate successfully. During these instances, feelings and personal contributions of the students were also acknowledged and made continuous with the scientific practice. The results were compared with earlier research, implications are discussed, and some suggestions are given about how these can be used by teachers in order to support student interest.

  • 6.
    Anderhag, Per
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Botaniska institutionen.
    Hepler, P. K.
    Lazzaro, M. D.
    Microtubules and microfilaments are both responsible for pollen tube elongation in the coniferPicea abies (Norway spruce)2000Ingår i: Protoplasma, ISSN 0033-183X, E-ISSN 1615-6102, Vol. 214, nr 3, s. 141-157Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    InPicea abies (Norway spruce), microtubules and actin microfllaments both form a dense matrix throughout the tube mainly parallel to the direction of elongation. In these conifer pollen tubes the organization of this matrix is different from that in angiosperms. This study tests our hypothesis that differences in cytoskeletal organization are responsible for differences in tube growth and physiology. Pollen grains were germinated in media containing cytoskeletal disrupters and analyzed for germination, tube length, tube branching, and tip swelling. Disruption of microtubules significantly inhibits tube elongation and induces tube branching and tip swelling. Tip swelling is probably caused by disruption of the microtubules in the tip that are perpendicular to the direction of elongation. Confocal microscopy indicates that colchicine and propyzamide cause fragmentation of microtubules throughout the tube. Oryzalin and amiprophosmethyl cause a complete loss of microtubules from the tip back toward the tube midpoint but leave microtubules intact from the midpoint back to the grain. Disruption of microfilaments by cytochalasins B and D and inhibition of myosin by N-ethylmaleimide or 2,3-butanedione monoxime stops tube growth and inhibits germination. Microfilament disruption induces short branches in tubes, probably originating from defective microfilament organization behind the tip. In addition, confocal microscopy coupled with microinjection of fluorescein-labeled phalloidin into actively growing pollen tubes indicates that microfllament bundles extend into the plastid-free zone at the tip but are specifically excluded from the growing tip. We conclude that microtubules and microfilaments coordinate to drive tip extension in conifer pollen tubes in a model that differs from angiosperms.

  • 7.
    Anderhag, Per
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för matematikämnets och naturvetenskapsämnenas didaktik.
    Selander, Staffan
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Eva, Svärdemo-Åberg
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för pedagogik och didaktik.
    Interaktivitet och hypertextualitet: om digital konmmunikation och digitala läromedel2015Ingår i: Utm@ningar och e-frestelser: IT och skolans lärkultur / [ed] Roger Säljö, Jonas Linderoth, Lund: Studentlitteratur AB, 2015, 2. uppl., nr 2Kapitel i bok, del av antologi (Övrigt vetenskapligt)
  • 8.
    Anderhag, Per
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för matematikämnets och naturvetenskapsämnenas didaktik.
    Wickman, Per-Olof
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för matematikämnets och naturvetenskapsämnenas didaktik.
    An evalutation of how NTA is helping schools to attain the Science Studies syllabus goals at the grade 5 level2007Rapport (Övrigt vetenskapligt)
  • 9.
    Anderhag, Per
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för matematikämnets och naturvetenskapsämnenas didaktik.
    Wickman, Per-Olof
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för matematikämnets och naturvetenskapsämnenas didaktik.
    Signs of taste for science: A methodology for studying the constitution of interest in the science classroom.2012Konferensbidrag (Refereegranskat)
  • 10.
    Anderhag, Per
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för matematikämnets och naturvetenskapsämnenas didaktik.
    Wickman, Per-Olof
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för matematikämnets och naturvetenskapsämnenas didaktik.
    Taste for science: bridging the Cartesian divide between interest and cognitive learning in science?2015Konferensbidrag (Refereegranskat)
    Abstract [en]

    Emotions, aesthetics and affect are natural elements in everyday science classroom practice, but our understanding of their role for learning in science is limited. It has been suggested that the epistemological tradition of approaching human conduct as essentially separated intovarious dualisms, such as social-mental, emotion-cognition, fact-value, body-mind and so forth, can explain why affect and learning have received so relatively little attention from the science education research field. This theoretical paper addresses some of these issues by discussing how the concept of taste, which is grounded in the works of Pierre Bourdieu and pragmatism research on aesthetics and learning, can be used for approaching cognition, norms, and values as simultaneously transacted in classroom action.

  • 11.
    Anderhag, Per
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för matematikämnets och naturvetenskapsämnenas didaktik.
    Wickman, Per-Olof
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för matematikämnets och naturvetenskapsämnenas didaktik.
    Bergqvist, Kerstin
    Jakobson, Britt
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för matematikämnets och naturvetenskapsämnenas didaktik.
    Hamza, Karim Mikael
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för matematikämnets och naturvetenskapsämnenas didaktik.
    Saljo, Roger
    Why Do Secondary School Students Lose Their Interest in Science? Or Does it Never Emerge? A Possible and Overlooked Explanation2016Ingår i: Science Education, ISSN 0036-8326, E-ISSN 1098-237X, Vol. 100, nr 5, s. 791-813Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this paper, we review research on how students' interest in science changes through the primary to secondary school transition. In the literature, the findings generally show that primary students enjoy science but come to lose interest during secondary school. As this claim is based mainly on interview and questionnaire data, that is on secondary reports from students about their interest in science, these results are reexamined through our own extensive material from primary and secondary school on how interest is constituted through classroom discourse. Our results suggest the possibility that primary students do not lose their interest in science, but rather that an interest in science is never constituted. The overview indicates that studies relying on interviews and questionnaires make it difficult to ascertain what the actual object of interest is when students act in the science classroom. The possibility suggested should, if valid, have consequences for science education and be worthy of further examination.

  • 12.
    Anderhag, Per
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för matematikämnets och naturvetenskapsämnenas didaktik.
    Wickman, Per-Olof
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för matematikämnets och naturvetenskapsämnenas didaktik.
    Hamza, Karim
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för matematikämnets och naturvetenskapsämnenas didaktik.
    What difference can a teacher make for the constitution of taste in the science classroom?:  2013Konferensbidrag (Refereegranskat)
  • 13.
    Anderhag, Per
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för matematikämnets och naturvetenskapsämnenas didaktik.
    Wickman, Per-Olof
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för matematikämnets och naturvetenskapsämnenas didaktik.
    Hamza, Karim Mikael
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för matematikämnets och naturvetenskapsämnenas didaktik.
    How can teaching make a difference to students’ interest in science? Including Bourdieuan field analysis2015Ingår i: Cultural Studies of Science Education, ISSN 1871-1502, E-ISSN 1871-1510, Vol. 10, nr 2, s. 377-380Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this article we respond to the discussion by Alexandra Schindel Dimick regarding how the taste analysis presented in our feature article can be expanded within a Bourdieuan framework. Here we acknowledge the significance of field theory to introduce wider reflexivity on the kind of taste that is constituted in the science classroom, while we at the same time emphasize the importance of differentiating between how taste is reproduced versus how it is changed through teaching. The contribution of our methodology is mainly to offer the possibility to empirically analyze changes in this taste, and how teaching can make a difference in regard to students’ home backgrounds. However, our last two steps of our taste analysis include asking questions about how the taste developing in the classroom relates more widely in society. Schindel Dimick shows how these two steps can be productively expanded by a wider societal field analysis.

  • 14.
    Anderhag, Per
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för matematikämnets och naturvetenskapsämnenas didaktik.
    Wickman, Per-Olof
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för matematikämnets och naturvetenskapsämnenas didaktik.
    Hamza, Karim Mikael
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för matematikämnets och naturvetenskapsämnenas didaktik.
    Signs of taste for science: a methodology for studying the constitution of interest in the science classroom2015Ingår i: Cultural Studies of Science Education, ISSN 1871-1502, E-ISSN 1871-1510, Vol. 10, nr 2, s. 339-368Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this paper we present a methodological approach for analyzing the transformation of interest in science through classroom talk and action. To this end, we use the construct of taste for scienceas a social and communicative operationalization, or proxy, to the more psychologically oriented construct of interest. To gain a taste for science as part of school science activities means developing habits of performing and valuing certain distinctions about ways to talk, act and be that are jointly construed as belonging in the school science classroom. In this view, to learn science is not only about learning the curriculum content, but also about learning a normative and aesthetic content in terms of habits of distinguishing and valuing. The approach thus complements previous studies on students’ interest in science, by making it possible to analyze how taste for science is constituted, moment-by-moment, through talk and action in the science classroom. In developing the method, we supplement theoretical constructs coming from pragmatism and Pierre Bourdieu with empirical data from a lower secondary science classroom. The application of the method to this classroom demonstrates the potential that the approach has for analyzing how conceptual, normative, and aesthetic distinctions within the science classroom interact in the constitution of taste for, and thereby potentially also in the development of interest in science among students.

  • 15.
    Anderhag, Per
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för matematikämnets och naturvetenskapsämnenas didaktik.
    Wickman, Per-Olof
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för matematikämnets och naturvetenskapsämnenas didaktik.
    Jakobson, Britt
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för matematikämnets och naturvetenskapsämnenas didaktik.
    Hamza, Karim Mikael
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för matematikämnets och naturvetenskapsämnenas didaktik.
    Why do secondary school students lose their interest in science?: A possible overlooked explanationManuskript (preprint) (Övrigt vetenskapligt)
  • 16.
    Andreasson, Björn Pererik
    et al.
    Swiss Light Source, Paul Scherrer Institut, Villigen, Switzerland.
    Janousch, M.
    Swiss Light Source, Paul Scherrer Institut, Villigen, Switzerland.
    Staub, U.
    Swiss Light Source, Paul Scherrer Institut, Villigen, Switzerland.
    Meijer, G. I.
    IBM Research, Zurich Research Laboratory, Rüschlikon, Switzerland.
    Spatial distribution of oxygen vacancies in Cr-doped SrTiO3 during an electric-field-driven insulator-to-metal transition2009Ingår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 94, nr 1, s. Article number: 013513-Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Spatially resolved x-ray fluorescence maps are presented that show the introduction and the evolution of oxygen vacancies in chromium-doped strontium titanate during an electric-field-driven insulator-to-metal transition. The vacancies are introduced at the anode and diffuse through the crystal toward the cathode. The spatial distribution of vacancies is explained by a model describing the electrical breakdown as a percolation process. Strong differences in the vacancy distribution were found when the transition took place in air and in a hydrogen-enriched atmosphere. In air, the vacancies disappeared from the surface, whereas in the reducing hydrogen atmosphere, they remained at the surface. © 2009 American Institute of Physics.

  • 17.
    Andreasson, Björn Pererik
    et al.
    Swiss Light Source, Paul Scherrer Institut, Villigen, Switzerland.
    Janousch, M.
    Swiss Light Source, Paul Scherrer Institut, Villigen, Switzerland.
    Staub, U.
    Swiss Light Source, Paul Scherrer Institut, Villigen, Switzerland.
    Meijer, G. I.
    IBM Research, Zurich Research Laboratory, Rüschlikon, Switzerland.
    Delley, B.
    Swiss Light Source, Paul Scherrer Institut, Villigen, Switzerland.
    Resistive switching in Cr-doped SrTiO3: An X-ray absorption spectroscopy study2007Ingår i: Materials Science & Engineering: B. Solid-state Materials for Advanced Technology, ISSN 0921-5107, E-ISSN 1873-4944, Vol. 144, nr 1-3, s. 60-63Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    X-ray absorption spectroscopy was used to study the microscopic origin of conductance and resistive switching in chromium-doped strontium titanate (Cr:SrTiO3). Differences in the X-ray absorption near edge spectroscopy (XANES) at the Cr K-edge indicate that the valence of Cr changes from 3+ to 4+ underneath the anode of our sample device after the application of an electric field. Spatially resolved X-ray fluorescence microscopy (μ-XRF) maps show that the Cr4+ region retracts from the anode-Cr:SrTiO3 interface after a conducting state has been achieved. This interface region is studied with extended X-ray absorption fine structure (EXAFS) and the results are compared with structural parameters obtained from density functional theory (DFT) calculations. They confirm that oxygen vacancies which are localized at the octahedron with a Cr at its center are introduced at the interface. It is proposed that the switching state is not due to a valence change of chromium but caused by changes of oxygen vacancies at the interface. © 2007 Elsevier B.V. All rights reserved.

  • 18.
    Andreasson, Björn Pererik
    et al.
    Swiss Light Source, Paul Scherrer Institut, Villigen, Switzerland.
    Janousch, M.
    Swiss Light Source, Paul Scherrer Institut, Villigen, Switzerland.
    Staub, U.
    Swiss Light Source, Paul Scherrer Institut, Villigen, Switzerland.
    Meijer, G. I.
    IBM Research, Zurich Research Laboratory, Rüschlikon, Switzerland.
    Ramar, A.
    École Polytechnique Fédérale de Lausanne (EPFL), Centre de Recherche en Physique des Plasmas, Association Euratom-Confédération Suisse, Villigen, Switzerland & Center for Electron Nanoscopy, Technical University of Denmark, Lyngby, Denmark.
    Krbanjevic, J.
    École Polytechnique Fédérale de Lausanne (EPFL), Centre de Recherche en Physique des Plasmas, Association Euratom-Confédération Suisse, Villigen, Switzerland.
    Schaeublin, R.
    École Polytechnique Fédérale de Lausanne (EPFL), Centre de Recherche en Physique des Plasmas, Association Euratom-Confédération Suisse, Villigen, Switzerland.
    Origin of oxygen vacancies in resistive switching memory devices2009Ingår i: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 190, s. Article number: 012074-Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The resistive switching state in Cr-doped SrTiO3 was induced by applying an electric field. This was done in ambient air and in an atmosphere of H2/Ar. The distribution of the thereby introduced oxygen vacancies was studied by spatially resolved X-ray fluorescence images. It was concluded that the oxygen vacancies were introduced in the interface between the SrTiO3 and the positively biased electrode. © 2009 IOP Publishing Ltd.

  • 19.
    Andreasson, Björn Pererik
    et al.
    Swiss Light Source, Paul Scherrer Institut, Villigen, Switzerland.
    Janousch, M.
    Swiss Light Source, Paul Scherrer Institut, Villigen, Switzerland.
    Staub, U.
    Swiss Light Source, Paul Scherrer Institut, Villigen, Switzerland.
    Todorova, T.
    Condensed Matter Theory Group, Paul Scherrer Institut, Villigen, Switzerland.
    Delley, B.
    Condensed Matter Theory Group, Paul Scherrer Institut, Villigen, Switzerland.
    Meijer, G. I.
    IBM Research, Zurich Research Laboratory, Rüschlikon, Switzerland.
    Pomjakushina, E.
    Laboratory for Developments and Methods, Paul Scherrer Institut, Villigen, Switzerland.
    Detecting oxygen vacancies in SrTiO3 by 3d transition-metal tracer ions2009Ingår i: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 80, nr 21, s. Article number: 212103-Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    X-ray absorption experiments on 3d transition-metal tracer ions in SrTiO3 are presented. The absorption spectra of the tracer-ion changed upon reduction in the SrTiO3. This change is due to an oxygen vacancy created at the tracer-ion site. This finding is supported by density-functional theory calculations, which prove that the oxygen vacancies preferentially are created at the tracer-ion sites. Using the chemical sensitivity of x-ray absorption spectroscopy, tracer ions can be used to detect oxygen vacancies in SrTiO3 and possibly in other oxide systems. © 2009 The American Physical Society.

  • 20.
    Friel, Ross
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Gerling-Gedin, Maria
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    Nilsson, Emil
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Tillämpad matematik och fysik (MPE-lab). Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Inbyggda system (CERES).
    Andreasson, Björn Pererik
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    3D Printed Radar Lenses with Anti-Reflective Structures2019Ingår i: Designs, E-ISSN 2411-9660, Vol. 3, nr 2, artikel-id 28Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Background: The purpose of this study was to determine if 3D printed lenses with wavelength specific anti-reflective (AR) surface structures would improve beam intensity and thus radar efficiency for a Printed Circuit Board (PCB)-based 60 GHz radar. This would have potential for improved low-cost radar lenses for the consumer product market. Methods: A hyperbolic lens was designed in 3D Computer Aided Design (CAD) software and was then modified with a wavelength specified AR structure. Electromagnetic computer simulation was performed on both the ‘smooth’ and ‘AR structure’ lenses and compared to actual 60 GHz radar measurements of 3D printed polylactic acid (PLA) lenses. Results: The simulation results showed an increase of 10% in signal intensity of the AR structure lens over the smooth lens. Actual measurement showed an 8% increase in signal of the AR structure lens over the smooth lens. Conclusions: Low cost and readily available Fused Filament Fabrication (FFF) 3D printing has been shown to be capable of printing an AR structure coated hyperbolic lens for millimeter wavelength radar applications. These 3D Printed AR structure lenses are effective in improving radar measurements over non-AR structure lenses.

  • 21.
    Hagström, A. L.
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Vass, L.A.M.
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Liu, F.
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Gerling, M.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    Karlsson, P-O
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    Nilsson, Emil
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    Andreasson, Björn Pererik
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    An iterative approach to determine the refractive index of 3D printed 60GHz PLA lenses2018Ingår i: Proceedings of the 14th Loughborough Antennas and Propagation Conference (LAPC 2018), Piscataway, N.J.: IEEE, 2018Konferensbidrag (Refereegranskat)
    Abstract [en]

    This paper describes an iterative approach to determine quasi-optical properties of standard 3D printer filament material to, in an inexpensive and fast way, construct focusing lenses for millimetre wave systems. Results from three lenses with different focal lengths are shown and discussed. The real part of the permittivity at 60GHz for polylactic acid (PLA) is in this paper determined to be εr=2.74. © 2018 Institution of Engineering and Technology. All rights reserved.

  • 22.
    Janousch, Markus
    et al.
    Swiss Light Source, Paul Scherrer Institut, Villigen, Switzerland.
    Meijer, G. Ingmar
    IBM Research, Zurich Research Laboratory, Rüschlikon, Switzerland.
    Staub, Urs
    Swiss Light Source, Paul Scherrer Institut, Villigen, Switzerland.
    Delley, Bernard
    Swiss Light Source, Paul Scherrer Institut, Villigen, Switzerland.
    Karg, Siegfried F.
    IBM Research, Zurich Research Laboratory, Rüschlikon, Switzerland.
    Andreasson, Björn Pererik
    Swiss Light Source, Paul Scherrer Institut, Villigen, Switzerland.
    Role of oxygen vacancies in cr-doped SrTiO3 for resistance-change memory2007Ingår i: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 19, nr 17, s. 2232-2235Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A high density of oxygen vacancies has been found in an experiment to determine the path of electrical conduction in Cr-doped SrTiO3 memory cells. The Cr acts as a seed for the localization of oxygen vacancies, leading to a statistically homogeneous distribution of charge carriers within the path. This warrants a controllable doping profile and improved device scaling down to the nanometer scale. The combination of laterally resolved micro-X-ray absorption spectroscopy and thermal imaging concludes that the resistance switching in Cr-doped SrTiO3 originates from an oxygen-vacancy drift to/from the electrode that was used as anode during the conditioning process. The experiments shows that this oxygen vacancy concept is crucial for the entire class of transition-metal-oxide-based bipolar resistance-change memory.

  • 23.
    Jurgilaitis, A.
    et al.
    Department of Physics & MAX IV Laboratory, Lund University, Lund, Sweden.
    Enquist, H.
    MAX IV Laboratory, Lund University, Lund, Sweden.
    Andreasson, Björn Pererik
    Department of Physics, Lund University, Lund, Sweden.
    Persson, A. I. H.
    Department of Physics, Lund University, Lund, Sweden.
    Borg, B. M.
    Department of Electrical and Information Technology, Lund University, Lund, Sweden.
    Caroff, P.
    Department of Electronic Materials Engineering, Research School of Physics and Engineering, The Australian National University, Canberra, Australia.
    Dick, K. A.
    Department of Physics, Lund University, Lund, Sweden & Division of Polymer and Materials Chemistry, Department of Chemistry, Lund University, Lund, Sweden.
    Harb, M.
    Department of Physics & MAX IV Laboratory, Lund University, Lund, Sweden.
    Linke, H.
    Department of Physics, Lund University, Lund, Sweden.
    Nüske, R.
    Department of Physics, Lund University, Lund, Sweden.
    Wernersson, L.-E.
    Department of Electrical and Information Technology, Lund University, Lund, Sweden.
    Larsson, J.
    Department of Physics, Lund University, Lund, Sweden.
    Time-Resolved X-ray Diffraction Investigation of the Modified Phonon Dispersion in InSb Nanowires2014Ingår i: Nano letters (Print), ISSN 1530-6984, E-ISSN 1530-6992, Vol. 14, nr 2, s. 541-546Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The modified phonon dispersion is of importance for understanding the origin of the reduced heat conductivity in nanowires. We have measured the phonon dispersion for 50 nm diameter InSb (111) nanowires using time-resolved X-ray diffraction. By comparing the sound speed of the bulk (3880 m/s) and that of a classical thin rod (3600 m/s) to our measurement (2880 m/s), we conclude that the origin of the reduced sound speed and thereby to the reduced heat conductivity is that the C44 elastic constant is reduced by 35% compared to the bulk material. © 2014 American Chemical Society.

  • 24.
    Karthik, K. R. G.
    et al.
    School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore.
    Andreasson, Björn Pererik
    School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore.
    Sun, C.
    School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore.
    Pramana, S. S.
    School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore.
    Varghese, B.
    Department of Physics, National University of Singapore, Singapore, Singapore.
    Sow, C. H.
    Department of Physics, National University of Singapore, Singapore, Singapore.
    Mathews, N.
    School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore.
    Wong, L. H.
    School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore.
    Mhaisalkar, S. G.
    School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore.
    Physical and Electrical Properties of Single Zn2SnO4 Nanowires2011Ingår i: Electrochemical and solid-state letters, ISSN 1099-0062, E-ISSN 1944-8775, Vol. 14, nr 1, s. K5-K7Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Electrical characterizations of single Zn2SnO4 (ZTO) nanowire devices are presented. These include resistivity, mobility, and photosensing measurements. The resistivity and the mobility of the Zn2SnO4 nanowire were measured to be 5.6 cm and 0.2 cm2/Vs, respectively. These values were found to be strongly dependent on the amount of electron-donating defects and less dependent on the thickness of the nanowires. An increase in the resistivity when changing the ambient atmosphere is observed. This change is caused by defect states lying in the bandgap, as shown by photoluminescence. The results imply the potential of ZTO nanowires as phototransistors and other photosensitive devices. © 2010 The Electrochemical Society.

  • 25.
    Mathews, Nripan
    et al.
    School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore.
    Varghese, Binni
    Department of Physics, National University of Singapore, Singapore, Singapore.
    Sun, Cheng
    School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore.
    Thavasi, Velmurugan
    NUS Nanoscience and Nanotechnology Initiative, Faculty of Engineering, National University of Singapore, Singapore, Singapore.
    Andreasson, Björn Pererik
    School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore.
    Sow, Chornghaur H.
    Department of Physics, National University of Singapore, Singapore, Singapore.
    Ramakrishna, Seeram
    Department of Physics, National University of Singapore, Singapore, Singapore & King Saud University, Riyadh, Saudi Arabia.
    Mhaisalkar, Subodh G.
    School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore.
    Oxide nanowire networks and their electronic and optoelectronic characteristics2010Ingår i: Nanoscale, ISSN 2040-3364, E-ISSN 2040-3372, Vol. 2, nr 10, s. 1984-1998Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Oxide nanowire networks or oxide nanonets leverage some of the exceptional functionalities of one-dimensional nanomaterials along with the fault tolerance and flexibility of interconnected nanowires to creating exciting opportunities in large-area electronics as well as green energy systems. This paper reviews the electronic and optoelectronic properties of these networks and highlights their potential applications in field-effect transistors, optoelectronic devices, and solar cells. Techniques to grow nanowires and their subsequent integration into networks using contact printing and electrospinning are described. Electrical properties of field-effect transistors fabricated from contact printed nanowire networks are discussed, and means of integration of the nanowire networks of heterogenous materials that enable ambipolar device operation are outlined. Photocurrent properties of these nanowires are described, including the dye sensitization of large-bandgap SnO2 nanowires. The final section deals with the advantages of employing nanowire networks in dye-sensitized solar cells and the dependence of solar cell performance on morphology and surface area. © The Royal Society of Chemistry 2010.

  • 26.
    McGawley, Kerry
    et al.
    Mittuniversitetet, Fakulteten för humanvetenskap, Institutionen för hälsovetenskap.
    Andersson, Per-Ivar
    Mittuniversitetet, Fakulteten för humanvetenskap, Institutionen för hälsovetenskap.
    Quantifying the effects of an optimised physical training programme in pre-season: does order matter?2012Konferensbidrag (Refereegranskat)
  • 27.
    McGawley, Kerry
    et al.
    Mittuniversitetet, Fakulteten för humanvetenskap, Avdelningen för hälsovetenskap.
    Andersson, Per-Ivar
    Mittuniversitetet, Fakulteten för humanvetenskap, Avdelningen för hälsovetenskap.
    The order of concurrent training does not affect soccer-related performance adaptations2013Ingår i: International Journal of Sports Medicine, ISSN 0172-4622, E-ISSN 1439-3964, Vol. 34, nr 11, s. 983-990Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Despite the wealth of evidence regarding physical training strategies in soccer, there is little information regarding soccer-specific concurrent training and the effects of training order. The current study aimed to: i) quantify the effects of concurrent high-intensity run-based training (HIT) and strength- and power-based training (STR) on soccer-specific performance, and ii) investigate the order effect of completing HIT and STR either first or second within training sessions. Eighteen semi- and fully-professional players completed a battery of field- and gym-based tests before and after a 5-week pre-season training intervention. Players were pair-matched and completed 3 sessions per week of HIT followed by STR (n=9) or STR followed by HIT (n=9). ANCOVA tests revealed no differences between groups for changes in any of the measures (p>0.05). However, a training effect was observed for all measures (p<0.05), with 10-m sprint, 6×30-m repeated sprint, 40-m agility and Yo-Yo test performances improving by 1.8±2.6%, 1.3±1.8%, 1.0±1.5% and 19.4±23.4%, respectively (n=18). In conclusion, there was a positive effect of the concurrent training approach on key measures of soccer performance, but the order of completing HIT and STR appears inconsequential to performance adaptations.

  • 28.
    Persson, A. I. H.
    et al.
    Department of Physics, Lund University, Lund, Sweden.
    Enquist, H.
    MAX IV Laboratory, Lund University, Lund, Sweden.
    Jurgilaitis, A.
    MAX IV Laboratory, Lund University, Lund, Sweden.
    Andreasson, Björn Pererik
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS). Department of Physics, Lund University, Lund, Sweden.
    Larsson, J.
    Department of Physics & MAX IV Laboratory, Lund University, Lund, Sweden.
    Real-time observation of coherent acoustic phonons generated by an acoustically mismatched optoacoustic transducer using x-ray diffraction2015Ingår i: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 118, nr 18, artikel-id 185308Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The spectrum of laser-generated acoustic phonons in indium antimonide coated with a thin nickel film has been studied using time-resolved x-ray diffraction. Strain pulses that can be considered to be built up from coherent phonons were generated in the nickel film by absorption of short laser pulses. Acoustic reflections at the Ni-InSb interface leads to interference that strongly modifies the resulting phonon spectrum. The study was performed with high momentum transfer resolution together with high time resolution. This was achieved by using a third-generation synchrotron radiation source that provided a high-brightness beam and an ultrafast x-ray streak camera to obtain a temporal resolution of 10 ps. We also carried out simulations, using commercial finite element software packages and on-line dynamic diffraction tools. Using these tools, it is possible to calculate the time-resolved x-ray reflectivity from these complicated strain shapes. The acoustic pulses have a peak strain amplitude close to 1%, and we investigated the possibility to use this device as an x-ray switch. At a bright source optimized for hard x-ray generation, the low reflectivity may be an acceptable trade-off to obtain a pulse duration that is more than an order of magnitude shorter. © 2015 Author(s).

  • 29.
    Pham, Thien Viet
    et al.
    Energy Research Institute at NTU (ERIatN), Singapore, Singapore.
    Rao, Manohar
    Energy Research Institute at NTU (ERIatN), Singapore, Singapore.
    Andreasson, Björn Pererik
    Energy Research Institute at NTU (ERIatN), Singapore, Singapore.
    Peng, Yuan
    School of Material Science and Engineering, Nanyang Technological University, Singapore, Singapore.
    Wang, Junling
    School of Material Science and Engineering, Nanyang Technological University, Singapore, Singapore.
    Jinesh, K. B.
    Energy Research Institute at NTU (ERIatN), Singapore, Singapore.
    Photocarrier generation in CuxO thin films deposited by radio frequency sputtering2013Ingår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 102, nr 3, s. Article number: 032101-Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Copper oxides (CuxO) thin films were deposited using radio frequency (RF) sputtering on glass substrates. By tuning the argon (Ar) partial pressure during deposition, cuprous oxide (Cu2O), cupric oxide (CuO), or their mixed phase could be achieved. Drastic variations in the Hall mobility, hole density, and resistivity of the samples were observed due to the presence of different phases in the films. Kelvin probe studies indicate that the photo-generated carriers have lower recombination rate in pure Cu 2O phase. This was further validated by transient absorption measurements, where the estimated carrier lifetime for Cu2O was much larger that other phases. © 2013 American Institute of Physics.

  • 30.
    Sjökvist, Jesper
    et al.
    Mittuniversitetet, Fakulteten för humanvetenskap, Institutionen för hälsovetenskap.
    McGawley, Kerry
    Mittuniversitetet, Fakulteten för humanvetenskap, Institutionen för hälsovetenskap.
    Andersson, Erik
    Mittuniversitetet, Fakulteten för humanvetenskap, Institutionen för hälsovetenskap.
    Andersson, Per-Ivar
    Mittuniversitetet, Fakulteten för humanvetenskap, Institutionen för hälsovetenskap.
    Andersson, Helena
    Holmberg, Hans-Christer
    Mittuniversitetet, Fakulteten för humanvetenskap, Institutionen för hälsovetenskap.
    Physical and performance characteristics of high-level female soccer goalkeepers2012Konferensbidrag (Refereegranskat)
  • 31.
    Taha, Walid
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Duracz, Adam
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Zeng, Yingfu
    Rice University, Houston TX, USA.
    Atkinson, Kevin
    Rice University, Houston TX, USA.
    Bartha, Ferenc Ágoston
    Rice University, Houston TX, USA.
    Brauner, Paul
    Rice University, Houston TX, USA.
    Duracz, Jan
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Xu, Fei
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Cartwright, Robert
    Rice University, Houston TX, USA.
    Konečný, Michal
    Computer Science Group, Aston University, Birmingham, United Kingdom.
    Moggi, Eugenio
    University of Genova, Genoa, Italy.
    Masood, Jawad
    Rice University, Houston TX, USA.
    Andreasson, Björn Pererik
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Inoue, Jun
    Rice University, Houston TX, USA.
    Sant'Anna, Anita
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Philippsen, Roland
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Chapoutot, Alexandre
    ENSTA ParisTech - U2IS, Paris, France.
    O'Malley, Marcia
    Department of Mechanical Engineering, Rice University, Houston TX, USA.
    Ames, Aaron
    School of Mechanical Eng., Georgia Institute of Technology, Atlanta GA, USA.
    Gaspes, Veronica
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Hvatum, Lise
    Schlumberger, Houston TX, USA.
    Mehta, Shyam
    Schlumberger, Houston TX, USA.
    Eriksson, Henrik
    Dependable Systems, SP Technical Research Institute of Sweden, Borås, Sweden.
    Grante, Christian
    AB Volvo, Gothenburg, Sweden.
    Acumen: An Open-source Testbed for Cyber-Physical Systems Research2016Ingår i: Internet of Things. IoT Infrastructures: Second International Summit, IoT 360° 2015, Rome, Italy, October 27-29, 2015. Revised Selected Papers, Part I / [ed] Benny Mandler, Johann Marquez-Barja, Miguel Elias Mitre Campista, Dagmar Cagáňová, Hakima Chaouchi, Sherali Zeadally, Mohamad Badra, Stefano Giordano, Maria Fazio, Andrey Somov & Radu-Laurentiu Vieriu, Heidelberg: Springer, 2016, Vol. 169, s. 118-130Konferensbidrag (Refereegranskat)
    Abstract [en]

    Developing Cyber-Physical Systems requires methods and tools to support simulation and verification of hybrid (both continuous and discrete) models. The Acumen modeling and simulation language is an open source testbed for exploring the design space of what rigorous-but-practical next-generation tools can deliver to developers of Cyber-Physical Systems. Like verification tools, a design goal for Acumen is to provide rigorous results. Like simulation tools, it aims to be intuitive, practical, and scalable. However, it is far from evident whether these two goals can be achieved simultaneously.

    This paper explains the primary design goals for Acumen, the core challenges that must be addressed in order to achieve these goals, the "agile research method" taken by the project, the steps taken to realize these goals, the key lessons learned, and the emerging language design. © ICST Institute for Computer Sciences, Social Informatics and Telecommunications Engineering 2016.

  • 32.
    Wickman, Per-Olof
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för matematikämnets och naturvetenskapsämnenas didaktik.
    Jakobson, Britt
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för matematikämnets och naturvetenskapsämnenas didaktik.
    Anderhag, Per
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för matematikämnets och naturvetenskapsämnenas didaktik.
    Taste and aesthetics in science education2014Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    We present the result of more than ten years of research transforming John Dewey’s writings into operational concepts that can be used to study empirically how education influences students’ interest and learning in school. Here we report results from science education on how (1) aesthetic experience and its continuity with learning and participation can be studied in classrooms, (2) such studies can be employed to meliorate school practice, and (3) this conceptual apparatus has been employed to study the formation of taste and interest in classrooms beyond that which students accrued because of their home background. To support the theoretical basis of these studies they also draw on Ludwig Wittgenstein’s philosophical investigations into language and Pierre Bourdieu’s macro-sociological studies of French society. The validity of this perhaps surprising combination of scholars will be supported pragmatically by how their methodological and conceptual developments can be made continuous for the purpose of better coping with (1)–(3).

  • 33.
    Zalden, Peter
    et al.
    Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, USA & Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, USA & European XFEL, Schenefeld, Germany.
    Quirin, Florian
    Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Duisburg, Germany.
    Schumacher, Mathias
    Institut für Theoretische Festkörperphysik, JARA-FIT and JARA-HPC, RWTH Aachen University, Aachen, Germany.
    Siegel, Jan
    Instituto de Optica, Consejo Superior de Investigaciones Científicas, Madrid, Spain.
    Wei, Shuai
    I. Physikalisches Institut and JARA-FIT, RWTH Aachen, Aachen, Germany.
    Koc, Azize
    Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Duisburg, Germany & Institut für Physik und Astronomie, Universität Potsdam, Potsdam, Germany.
    Nicoul, Matthieu
    Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Duisburg, Germany.
    Trigo, Mariano
    Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, USA & Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, USA.
    Andreasson, Björn Pererik
    Department of Physics, Lund University, Lund, Sweden.
    Enquist, Henrik
    Department of Physics, Lund University, Lund, Sweden.
    Shu, Michael
    Department of Applied Physics, Stanford University, Stanford, USA.
    Pardini, Tommaso
    Lawrence Livermore National Laboratory, Livermore, USA.
    Chollet, Matthieu
    Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, USA.
    Zhu, Diling
    Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, USA.
    Lemke, Henrik
    Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, USA & Paul Scherrer Institute, Villigen, Switzerland.
    Ronneberger, Ider
    Institut für Theoretische Festkörperphysik, JARA-FIT and JARA-HPC, RWTH Aachen University, Aachen, Germany.
    Larsson, Jörgen
    Department of Physics, Lund University, Lund, Sweden.
    Lindenberg, Aaron
    Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, USA & Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, USA & Department of Materials Science and Engineering, Stanford University, Stanford, USA.
    Fischer, Henry
    Institut Laue-Langevin, Grenoble, France.
    Hau-Riege, Stefan
    Lawrence Livermore National Laboratory, Livermore, USA.
    Reis, David
    Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, USA & Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, USA.
    Mazzarello, Riccardo
    Institut für Theoretische Festkörperphysik, JARA-FIT and JARA-HPC, RWTH Aachen University, Aachen, Germany.
    Wuttig, Matthias
    I. Physikalisches Institut and JARA-FIT, RWTH Aachen, Aachen, Germany & PGI 10 (Green IT), Forschungszentrum Jülich, Jülich, Germany.
    Sokolowski-Tinten, Klaus
    Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Duisburg, Germany.
    Femtosecond x-ray diffraction reveals a liquid–liquid phase transition in phase-change materials2019Ingår i: Science, ISSN 0036-8075, E-ISSN 1095-9203, Vol. 364, nr 6445, s. 1062-1067Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In phase-change memory devices, a material is cycled between glassy and crystalline states. The highly temperature-dependent kinetics of its crystallization process enables application in memory technology, but the transition has not been resolved on an atomic scale. Using femtosecond x-ray diffraction and ab initio computer simulations, we determined the time-dependent pair-correlation function of phase-change materials throughout the melt-quenching and crystallization process. We found a liquid–liquid phase transition in the phase-change materials Ag4In3Sb67Te26 and Ge15Sb85 at 660 and 610 kelvin, respectively. The transition is predominantly caused by the onset of Peierls distortions, the amplitude of which correlates with an increase of the apparent activation energy of diffusivity. This reveals a relationship between atomic structure and kinetics, enabling a systematic optimization of the memory-switching kinetics. © 2019 American Association for the Advancement of Science.

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