Elastic Anomalies in Orbital-Degenerate Frustrated Spinel CoV2O4

Tadataka Watanabe, Shogo Yamada, Rui Koborinai, Takuro Katsufuji

    Research output: Contribution to journalArticle

    Abstract

    Ultrasound velocity measurements were performed on a single crystal of the orbital-degenerate frustrated spinel CoV2O4 in all the symmetrically-independent elastic moduli of the cubic crystal. The measurements of temperature dependence of the elastic moduli observed discontinuous elastic anomalies due to a ferrimagnetic transition at TC = 165 K and another phase transition at T = 50 K. Additionally, the measurements observed anomalous temperature dependence of the elastic moduli, specifically, non-monotonic temperature dependence in the magnetically-ordered phase below TC, and magnetic-field-sensitive elastic softening with decreasing temperature in the paramagnetic phase above TC. These anomalous temperature variations below and above TC should be driven by the coupling of lattice to magnetic excitations.

    Original languageEnglish
    Pages (from-to)898-901
    Number of pages4
    JournalUnknown Journal
    Volume75
    DOIs
    Publication statusPublished - 2015

    Keywords

    • Frustration
    • Orbital order
    • Sound velocity
    • Vanadate spinel

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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