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Magnetic-field induced coupling of quasi-degenerate phonon modes in the rare-earth compounds TmVO and TbF

Zeitschrift für Physik B Condensed Matter, ISSN: 0722-3277, Vol: 74, Issue: 2, Page: 259-265
1989
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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 TmVO and in orthorhombic TbF, 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 (TmVO) or depending on the direction of the spontaneous magnetization of the crystal (TbF). In magnetically ordered TbF an effective phonon-phonon coupling between modes of pure transverse and longitudinal polarization has been studied. This interaction results in an elliptical polarization of the coupled polar modes and transfers transition intensity to the quasi-longitudinal modes. The observed phenomena have been treated theoretically in full agreement with the experiments as higher order effects using the well established theory of magnetoelastic effects. © 1989 Springer-Verlag.

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