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Boson-fermion model beyond mean-field approximation.

By A. S. Alexandrov


A model of hybridized bosons and fermions is studied beyond the mean field approximation. The divergent boson self-energy at zero temperature makes the Cooper pairing of fermions impossible. The frequency and momentum dependence of the self- energy and the condensation temperature Tc of initially localized bosons are calculated analytically. The value of the boson condensation temperature Tc is below 1K which rules out the boson-fermion model with the initially localized bosons as a phenomenological explanation of high-temperature superconductivity. The intra-cell density-density fermion-boson interaction dominates in the fermion self-energy. The model represents a normal metal with strongly damped bosonic excitations. The latter play the role of normal impurities. PACS numbers:74.20.-z, 67.20+k Typeset Using REVTEX

Year: 1996
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