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손창희

Sohn, Chang Hee
Laboratory for Unobtainable Functional Oxides
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Strong Spin-Phonon Coupling Mediated by Single Ion Anisotropy in the All-In-All-Out Pyrochlore Magnet Cd2Os2O7

Author(s)
Sohn, C. H.Kim, C. H.Sandilands, L. J.Hien, N. T. M.Kim, S. Y.Park, H. J.Kim, K. W.Moon, S. J.Yamaura, J.Hiroi, Z.Noh, T. W.
Issued Date
2017-03
DOI
10.1103/PhysRevLett.118.117201
URI
https://scholarworks.unist.ac.kr/handle/201301/26300
Fulltext
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.118.117201
Citation
PHYSICAL REVIEW LETTERS, v.118, no.11, pp.117201
Abstract
Spin-phonon coupling mediated by single ion anisotropy was investigated using optical spectroscopy and first-principles calculations in the all-in-all-out pyrochlore magnet Cd2Os2O7. Clear anomalies were observed in both the phonon frequencies and linewidths at the magnetic ordering temperature. The renormalization of the phonon modes was exceptionally large, signifying the presence of an unconventional magnetoelastic term from large spin-orbit coupling. In addition, the relative phonon frequency shifts show a strong correlation with the modulation of noncubic crystal field by the corresponding lattice distortion. Our observation establishes a new type of spin-phonon coupling through single ion anisotropy, a second-order spin-orbit coupling term, in Cd2Os2O7.
Publisher
AMER PHYSICAL SOC
ISSN
0031-9007

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