Soft-x-ray magnetic-circular-dichroism study of the colossal-magnetoresistance spinel Fe0.5Cu0.5Cr2S4

Deb Aniruddha; Mizumaki Masaichiro; Muro Takayuki; Sakurai Yoshiharu; Tsurkan Vladimir

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DEB, Aniruddha, MIZUMAKI, Masaichiro, MURO, Takayuki, SAKURAI, Yoshiharu, TSURKAN, Vladimir. Soft-x-ray magnetic-circular-dichroism study of the colossal-magnetoresistance spinel Fe0.5Cu0.5Cr2S4. In: Physical Review B - Condensed Matter and Materials Physics, 2003, vol. 68, p. 0. ISSN 1098-0121. DOI: https://doi.org/10.1103/PhysRevB.68.014427

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Physical Review B - Condensed Matter and Materials Physics

Volumul 68 / 2003 / ISSN 1098-0121 /ISSNe 1550-235X

Soft-x-ray magnetic-circular-dichroism study of the colossal-magnetoresistance spinel Fe_0.5Cu_0.5Cr₂S₄

DOI:https://doi.org/10.1103/PhysRevB.68.014427

Pag. 0-0

Deb Aniruddha¹², Mizumaki Masaichiro¹, Muro Takayuki¹, Sakurai Yoshiharu¹, Tsurkan Vladimir³

¹ Japan Synchrotron Radiation Research Institute, Sayo, Hyogo,
² Lawrence Berkeley National Laboratory,
³ Institute of Applied Physics, Academy of Sciences of Moldova

Disponibil în IBN: 4 iulie 2023

Rezumat

We have investigated the electronic and magnetic structure of the colossal magnetoresistive Cr-based spinel Fe_0.5Cu_0.5Cr₂S₄ employing magnetic circular dichroism (MCD) of core level absorption (x-ray absorption spectroscopy) spectra in the soft x-ray region. The results here clearly establish that Fe is in the formal trivalent state (Fe³⁺) in this compound, resolving previous controversies. The Cr 2p and Fe 2p x-ray absorption and MCD spectra shows that the magnetic moment of the tetrahedrally coordinated Fe³⁺ are aligned antiparallel to those of the octahedrally coordinated Cr3+. The observed Cu 2p MCD spectra show existence of very small magnetic moments (<0.20μ_B) on the copper sites. The magnetic moments at the Fe and the Cr sites have been obtained based on the magneto-optical sum rules. The results are consistent with the band structure calculation based on the full potential augmented plane wave method.

Cuvinte-cheie
absorption, article, circular dichroism, electromagnetic field, magnetism, spectrum, X ray crystallography

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