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Abstract
YbMnO3 epitaxial thin films were investigated by Raman scattering in the temperature range of 15-300K. We successfully observed some phonon modes (5A1+6E2) at 15K with mode assignment based on polarized Raman study. Furthermore, an E2 mode at 253 cm-1 which affected Mn-O-Mn bond angles showed anomalous temperature variation in frequency at temperature below ~80K. It suggested a spin-phonon coupling that occurred below TN.
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