Journal Article

FZJ-2019-05395

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Soft X‐Ray Magnetic Circular Dichroism of Vanadium in the Metal–Insulator Two‐Phase Region of Paramagnetic V2O3 Doped with 1.1% Chromium

Schmitz, D. (Corresponding author) ; Schmitz-Antoniak, C.FZJ* ; Radu, F. ; Ryll, H. ; Luo, C. ; Bhandary, S. ; Biermann, S. ; Siemensmeyer, K. ; Wende, H. ; Ivanov, S. ; Eriksson, O.

2020
Wiley-VCH Weinheim

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Please use a persistent id in citations: http://hdl.handle.net/2128/24496  doi:10.1002/pssb.201900456

Abstract: 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 L2,3 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.

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Contributing Institute(s):

1. Elektronische Eigenschaften (PGI-6)

Research Program(s):

1. 522 - Controlling Spin-Based Phenomena (POF3-522) (POF3-522)

Appears in the scientific report 2020

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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