Abstract
The frequencies of A 2u phonons of the layer compounds ZrS 2 and HfS 2 are determined from two phonon resonant Raman scattering. The analysis based on the polarizable ion model by van der Valk and Haas suggests that the long-range Coulomb interaction plays an important role in the anisotropy of lattice dynamics. The A 1g phonon spectrum of ZrS 2 exhibits anomalous line shape induced by the hybridization of the A 1g phonon with the A 2u (LO).
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