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|Type:||Artigo de periódico|
|Title:||Electronic And Impurity-induced Raman Scattering In Mgo:co2+|
|Abstract:||Theoretical and experimental Raman-scattering studies of impurity-induced vibrations have been carried out in MgO:Co2+. The experimental spectra are taken as a function of temperature from 18°K to room temperature. The temperature dependence of a peak at 935.7 cm-1 indicates that its origin is of electronic nature. We assign it to the τ6→τ82 transition between the low-lying energy levels of the Co2+ ion in cubic fields. Theoretical calculations for the Raman spectra are presented, assuming the electron-phonon interactions to be a linear function of the displacements of the defect's first-, second-, third-, and fourth-nearest neighbors. This assumption leads to a very good agreement of the line-shape and peak positions between theory and experiment. As an alternative model, we also consider the perturbed-phonon model in which changes of the longitudinal force constants between the defect and its nearest neighbors as well as nearest and fourth-nearest neighbors have been assumed. This model leads to an unsatisfactory agreement between theory and experiment. © 1980 The American Physical Society.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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