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Armenian Journal of Physics=Ֆիզիկայի հայկական հանդես
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Title:
FALICOV-KIMBALL MODEL EXTENDED BY ELECTRON-PHONON INTERACTION (EPI)
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Subject:
Physics ; Physics of elementary particles
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Abstract:
The effect of electron-phonon interaction (EPI) has been investigated using extended Falicov-Kimball model in an exact method. Phonon-induced hybridization term is considered in terms of electron operators. Average occupation number off-electrons, entropy, specific heat, and spin susceptibility are calculated. First-order valence transition occurs at an increased value of EPI. Double-peak structure is observed in specific heat curves. The specific heat coefficient g rises sharply at low temperatures. EPI increases the rate of growth of antiferromagnetic correlations.