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Soft X-Ray Magnetic Circular Dichroism of Vanadium in the Metal-Insulator Two-Phase Region of Paramagnetic V2O3 Doped with 1.1% Chromium
Helmholtz Zentrum Berlin Mat & Energie, Inst Quantenphanomene Neuen Mat, Berlin, Germany.
Forschungszentrum Julich, Peter Grunberg Inst PGI 6, Julich, Germany.ORCID iD: 0000-0002-8450-3515
Helmholtz Zentrum Berlin Mat & Energie, Abt Mat Grune Spintron, Berlin, Germany.ORCID iD: 0000-0003-0284-7937
Helmholtz Zentrum Berlin Mat & Energie, Abt Mat Grune Spintron, Berlin, Germany.
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2019 (English)In: Physica status solidi. B, Basic research, ISSN 0370-1972, E-ISSN 1521-3951, article id 1900456Article in journal (Refereed) Published
Abstract [en]

V2O3 doped with 1.1% Cr is investigated at its isostructural correlation-driven metal-insulator transition near room temperature in its paramagnetic state with X-ray magnetic circular dichroism (XMCD) spectroscopy in external magnetic fields. A relative XMCD amplitude of about 2 permille is observed at the L-2,L-3 absorption edges of vanadium as expected for magnetic moment per mass values of the order of 1 J T-1 kg(-1) from magnetometry and the literature. Across the metal-insulator transition, the vanadium XMCD spectral shape significantly changes. According to atomic multiplet simulations, these changes are due to a changing orbital occupation indicating a changing phase composition. According to estimates used in this study, the dipole moment of the spin density distribution 7⟨Tz⟩ in the bulk increases such that the effective vanadium spin moment increases by a few percent with temperature in the two-phase region. Thereby, it partially compensates for the decrease in the relative XMCD amplitude due to a decreasing alignment of the paramagnetic moments. After a few minor temperature cycles, the sample is in a two-phase state in which the XMCD and X-ray linear dichroism spectra hardly depend on the temperature, and the specific electrical resistance is intermediate, showing only a weak sign of the metal-insulator transition.

Place, publisher, year, edition, pages
2019. article id 1900456
Keywords [en]
charge transfer multiplet simulations, dipole moment, spin density distribution, Cr doping, metal-insulator transition, V2O3, X-ray magnetic circular dichroism
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-397647DOI: 10.1002/pssb.201900456ISI: 000493865900001OAI: oai:DiVA.org:uu-397647DiVA, id: diva2:1374849
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation, 2013.0020Knut and Alice Wallenberg Foundation, 2012.0031EU, European Research Council, 617196eSSENCE - An eScience Collaboration
Note

Early access: The article have been peer-reviewed and accepted for publication. The article content has been finalized, but it has not been assigned to an issue yet.

Available from: 2019-12-03 Created: 2019-12-03 Last updated: 2019-12-03Bibliographically approved

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