Electronic states and possible origin of the orbital-glass state in a nearly metallic spinel cobalt vanadate: An x-ray magnetic circular dichroism study

Yosuke Nonaka, Goro Shibata, Rui Koborinai, Keisuke Ishigami, Shoya Sakamoto, Keisuke Ikeda, Zhendong Chi, Tsuneharu Koide, Arata Tanaka, Takuro Katsufuji, Atsushi Fujimori

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    Abstract

    We have investigated the orbital states of the orbital-glassy (short-range orbital ordered) spinel vanadate Co1.21V1.79O4 using x-ray absorption spectroscopy (XAS), x-ray magnetic circular dichroism (XMCD), and subsequent configuration-interaction cluster-model calculation. From the sign of the XMCD spectra, it was found that the spin magnetic moment of the Co ion is aligned parallel to the applied magnetic field and that of the V ion antiparallel to it, consistent with neutron scattering studies. It was revealed that the excess Co ions at the octahedral site take the trivalent low-spin state and induce a random potential to the V sublattice. The orbital magnetic moment of the V ion is small, suggesting that the ordered orbitals mainly consist of real-number orbitals.

    Original languageEnglish
    Article number205126
    JournalPhysical Review B
    Volume97
    Issue number20
    DOIs
    Publication statusPublished - 2018 May 22

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

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    Nonaka, Y., Shibata, G., Koborinai, R., Ishigami, K., Sakamoto, S., Ikeda, K., Chi, Z., Koide, T., Tanaka, A., Katsufuji, T., & Fujimori, A. (2018). Electronic states and possible origin of the orbital-glass state in a nearly metallic spinel cobalt vanadate: An x-ray magnetic circular dichroism study. Physical Review B, 97(20), [205126]. https://doi.org/10.1103/PhysRevB.97.205126