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Transport and magneto-transport properties in La0.8K0.2-xxMnO3-delta (x =0 and 0.1) manganites
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.ORCID iD: 0000-0002-3049-6831
Univ Sfax, Fac Sci Sfax, Lab Phys Appl, BP 802, Sfax 3018, Tunisia.
Inst Neel, CNRS, BP 166, F-38042 Grenoble 9, France;Univ Joseph Fourier, BP 166, F-38042 Grenoble 9, France.
2019 (English)In: Journal of materials science. Materials in electronics, ISSN 0957-4522, E-ISSN 1573-482X, Vol. 30, no 18, p. 17363-17373Article in journal (Refereed) Published
Abstract [en]

We discuss the effect of the nanometric grain size on the behavior of the electrical and magnetoresistive response of La0.8K0.2-xxMnO3-delta (x = 0 and 0.1) nanocrystalline samples that were prepared by a sol-gel method. The results from transport and magneto-transport measurements evidence a robust dependence on the nanometric grain size. The temperature dependence of the resistivity was evaluated using different transport models. The results reveal a field-dependent minimum of the resistivity in the low-temperature region, which can be described in terms of intergranular spin-polarized tunneling. Remarkably, a considerable increase of the magnetoresistance (MR) with the decrease of nanoparticle size was found, which might open a new way for the search for potential candidates for magnetoresistive devices. Besides, the magnetic field dependence of the MR was also analyzed, and a distinct drop of MR at low fields was noticed. This behavior was primarily explained by the spin-polarized tunneling transport of conduction electrons across grain boundaries.

Place, publisher, year, edition, pages
SPRINGER , 2019. Vol. 30, no 18, p. 17363-17373
National Category
Condensed Matter Physics
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URN: urn:nbn:se:uu:diva-395922DOI: 10.1007/s10854-019-02085-3ISI: 000487923600075OAI: oai:DiVA.org:uu-395922DiVA, id: diva2:1366670
Available from: 2019-10-30 Created: 2019-10-30 Last updated: 2019-10-30Bibliographically approved

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