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|Type:||Artigo de periódico|
|Title:||Stress-induced Changes In The Raman Spectrum Of Paratellurite|
|Abstract:||We studied the effect of uniaxial stress on the Raman spectrum of paratellurite, at room temperature. The observed changes are interpreted using a linear-deformation-potential theory that has been successfully applied in a wide variety of materials. This theory describes well the behavior of all observed lines when the force is applied along the  and  crystallographic directions. The shifts and splittings obtained when stress is applied along the  direction, however, are much larger than those expected on the basis of the aforementioned theory. This anomaly is stronger for the lowest-frequency B1 line which exhibits a strong supra-linear frequency increase for  stress. The anomalous behavior for  stress is believed to be due to the D44→D24 structural phase transition that takes place in paratellurite under hydrostatic stress, since a  stress produces a distortion of the same symmetry as the one responsible for the transition. Deformation-potential values for representative modes are obtained from measurements of pure modes and quasi modes and Grüneisen parameters calculated from these deformation potentials are in good agreement with those previously obtained from hydrostatic-pressure measurements. © 1977 The American Physical Society.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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