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We have measured near normal incidence far-infrared (FIR) reflectivity spectra of a single crystal of TbMnO3 from 10 K to 300 K in the spectral range of 50 cm−1–700 cm−1. Fifteen transverse optic (TO) and longitudinal optic (LO) modes are identified in the imaginary part of the dielectric function ɛ2(ω) and energy loss function Im(−1/ɛ(ω)), respectively. Some of the observed phonon modes show anomalous...
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