Orbital fluctuations in spinel Mn(V 1-xAl x) 2O 4 studied by thermal conductivity measurements

T. Omura, T. Ishikawa, Y. Ishitsuka, Takuro Katsufuji

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    Abstract

    We measured the thermal conductivity of spinel MnV 2O 4 and Al-doped samples with an applied magnetic field, and they exhibited orbital and spin ordering at low temperatures. We found that the thermal resistivity (reciprocal thermal conductivity) in the orbital-disordered phase is enhanced when the system approaches the critical point of the orbital ordering under the variation of both temperature and magnetic field, but it is suppressed when it crosses the critical point and goes into the orbital-ordered phase. This result indicates that the thermal conductivity of these compounds is dominated by the fluctuation of V t 2g orbitals.

    Original languageEnglish
    Article number054436
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume86
    Issue number5
    DOIs
    Publication statusPublished - 2012 Aug 21

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    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Electronic, Optical and Magnetic Materials

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