Abstract
In this work the effects of magnetoelastic interaction in Rare-Earth compounds between excited crystal field states and nondegenerate optical phonons have been studied in tetragonal TmVO4 and in orthorhombic TbF3, using Raman and far-infrared spectroscopy. In certain favourable cases a mutual energy renormalization of the phonons has been observed as a function of a magnetic field (TmVO4) or depending on the direction of the spontaneous magnetization of the crystal (TbF3).
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