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Raman studies of spin-phonon coupling in hexagonal BaFe12O 19

Title
Raman studies of spin-phonon coupling in hexagonal BaFe12O 19
Authors
Chen X.-B.Minh Hien N.T.Han K.Chul Sur J.Sung N.H.Cho B.K.Yang I.-S.
Ewha Authors
양인상
SCOPUS Author ID
양인상scopus
Issue Date
2013
Journal Title
Journal of Applied Physics
ISSN
0021-8979JCR Link
Citation
vol. 114, no. 1
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Phonon softening in hexagonal BaFe12O19 single crystal is observed in temperature dependent polarized Raman spectroscopy. The phonon softening is significantly enhanced below ∼80 K, at which the magnetization in a magnetic field along c-axis shows a clear change in the temperature dependence, indicating a magnetic phase transition near 80 K. Possible interpretations of the anomalous temperature dependence of the phonon frequencies-phonon softening behaviors are discussed. The phonon softening would be correlated to local structural and magnetic phase transition in hexagonal BaFe12O19, in which the spin-phonon coupling would have major contribution for the phonon softening. We also discuss that the spin-phonon coupling would be affected by both the spin ordering and the individual phonon vibration in magnetic material. © 2013 AIP Publishing LLC.
DOI
10.1063/1.4812575
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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