Journal of Physical Studies 3(3), 344–358 (1999) DOI: https://doi.org/10.30970/jps.03.344 RAMAN SCATTERING IN PSEUDOSPIN-ELECTRON MODEL

I. V. Stasyuk, T. S. Mysakovych
Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine,
1 Svientsitskii Str., Lviv, UA-79011, Ukraine

Anharmonic phonon (pseudospin) contributions to Raman light scattering in the crystals described by the pseudospin–electron model with the strong short–range electron correlation are investigated. The microscopic approach based on the operator expansion of the polarizability operator in powers of the electron transfer constant is used for calculation of the components of the Raman scattering tensor. The influence of the effective interaction between pseudospins via conducting electrons is taken into account in the framework of generalized random phase approximation. The features of the collective pseudospin dynamics are investigated; the scattering spectrum components connected with excitations of the pseudospin–wave type as well as with the reconstruction of electron spectrum at the pseudospin reorientation are separated. The frequency dependence of the Raman light scattering intensity is analyzed at various values of electron concentration and temperature.

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