Orbital reorientation in MnV2O4 observed by V NMR

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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 degrees 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 .
Publisher
NATURE PUBLISHING GROUP
Issue Date
2017-05
Language
English
Article Type
Article
Keywords

TRANSITIONS; DISTORTION; CRYSTAL

Citation

SCIENTIFIC REPORTS, v.7, pp.2178

ISSN
2045-2322
DOI
10.1038/s41598-017-02015-5
URI
http://hdl.handle.net/10203/224170
Appears in Collection
PH-Journal Papers(저널논문)
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