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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/1184

Title: Boson-fermion model beyond mean-field approximation
Authors: Alexandrov, A.S.
Issue Date: 1996
Abstract: 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 $T_{c}$ of initially localized bosons are calculated analytically. The value of the boson condensation temperature $T_{c}$ 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.
Description: This is a pre-print. It is also available at: http://arxiv.org/abs/cond-mat/9603111.
URI: https://dspace.lboro.ac.uk/2134/1184
Appears in Collections:Pre-Prints (Physics)

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