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Abstract
Raman scattering measurements under pressure were performed in a single crystal of TlGaS2. The analysis of the Raman spectrum suggests that the symmetry of the compound belongs to the monoclinic system. The obtained spectra were decomposed by using the deconvolution method, and the “mode-Grüneisen parameters” of the external and internal vibrational modes were calculated. A first order phase transition at 7.4GPa and at 10GPa for external and internal modes, respectively, was observed.
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