Orbital reorientation in MnV2O4 observed by v NMR

Euna Jo, Sejun Park, Jooseop Lee, Soonchil Lee, Jeong Hyun Shim, Takehito Suzuki, Takuro Katsufuji

    Research output: Contribution to journalArticle

    Abstract

    The simultaneous occurrence of the structural and magnetic phase transitions observed in MnV2O4 is one clear example of strong interplay among the spin, orbital and lattice degrees of freedom. The structure of MnV2O4 is switched by the magnetic field and the linear magnetostriction is very high. The orbital order mediates the interaction between the spin and the lattice generating these phenomena. In this work, we present experimental evidence of an orbital order in MnV2O4 and its reorientation under a rotating magnetic field as obtained by nuclear magnetic resonance(NMR). The shift in the resonance frequency of the V NMR spectrum is symmetrical with respect to 45° as an external magnetic field of 7 T rotates from the c-axis to the b-axis, indicating that the initial easy axis flips to the orthogonal direction most parallel to the field direction. The spectrum of V3+ ions splits into four peaks with a maximum shift of 40 MHz. Our analysis revealed that this is the combined effect of the anisotropic hyperfine field due to an ordered orbital and the dipolar hyperfine field. Reorientation of the orbital order in response to an external magnetic field accompanies the macroscopically observed magnetostriction in MnV2O4.

    Original languageEnglish
    Article number2178
    JournalScientific Reports
    Volume7
    Issue number1
    DOIs
    Publication statusPublished - 2017 Dec 1

    ASJC Scopus subject areas

    • General

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    Jo, E., Park, S., Lee, J., Lee, S., Shim, J. H., Suzuki, T., & Katsufuji, T. (2017). Orbital reorientation in MnV2O4 observed by v NMR. Scientific Reports, 7(1), [2178]. https://doi.org/10.1038/s41598-017-02015-5