Comment on "Boson-fermion model beyond the mean-field approximation"

Details Comment on "Boson-fermion model beyond the mean-field approximation" Comment on "Boson-fermion model beyond the mean-field approximation"

1997-05-09

arxiv.org/abs/cond-mat/9705089v1

J.Phys.:Condens.Matter 10, 3089 (1998)

Physics

Condensed Matter

Superconductivity

LaTeX, 5 pages, 2style files included, 4 embedded EPS figures, submitted to J.Phys.:Condens.Matter

Scientific paper

10.1088/0953-8984/10/13/024

In a recent paper [A.S.Alexandrov, J.Phys.:Condens.Matter 8, 6923 (1996); cond-mat/9603111], it has been suggested that there is no Cooper pairing in boson-fermion models of superconductivity. We show that this conjecture is based on an inconsistent approximation that violates an exact identity. Quite generally, the divergence of the fermion t-matrix (the Thouless criterion) is accompanied by the condensation of a boson mode.

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