Soft X-Ray Magnetic Circular Dichroism of Vanadium in the Metal-Insulator Two-Phase Region of Paramagnetic V2O3 Doped with 1.1% Chromium
| Autor: | Olle Eriksson, Hanjo Ryll, Silke Biermann, Sumanta Bhandary, Chen Luo, Florin Radu, Stefan Ivanov, Heiko Wende, Carolin Schmitz-Antoniak, Konrad Siemensmeyer, D. Schmitz |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Analytical chemistry Vanadium chemistry.chemical_element 02 engineering and technology spin density distribution 01 natural sciences V2O3 Paramagnetism Chromium Condensed Matter::Materials Science Condensed Matter::Superconductivity 0103 physical sciences ddc:530 Cr doping metal-insulator transition Isostructural Metal–insulator transition Controlling collective states charge transfer multiplet simulations 010302 applied physics Magnetic circular dichroism Doping dipole moment 021001 nanoscience & nanotechnology Condensed Matter Physics Electronic Optical and Magnetic Materials ddc chemistry X-ray magnetic circular dichroism Condensed Matter::Strongly Correlated Electrons 0210 nano-technology Den kondenserade materiens fysik |
| Zdroj: | Physica status solidi / B Basic research B 257(3), 1900456-(2020). doi:10.1002/pssb.201900456 |
| DOI: | 10.1002/pssb.201900456 |
| Popis: | 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. 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. |
| Databáze: | OpenAIRE |
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