Electron-phonon coupling in DyFeO3 revealed by infrared spectroscopy
Abstract
We have investigated crystal field and phonon dynamics of the multiferroic orthoferrite DyFeO3 via polarized infrared spectroscopy. Reflectance of single crystals was measured in the far- to mid-infrared spectral range at range of temperatures from 10-295 K. We observe a strongly anisotropic phonon spectrum which differs from earlier lattice dynamical calculations in its symmetry, as well as a mode with significant and unusual temperature dependence that we interpret as a coupled phonon-crystal-field excitation.
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