Comment on "Boson-fermion model beyond the mean-field approximation"
Superconductivity
2009-10-30 v1
Abstract
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.
Cite
@article{arxiv.cond-mat/9705089,
title = {Comment on "Boson-fermion model beyond the mean-field approximation"},
author = {R. Friedberg and H. C. Ren and O. Tchernyshyov},
journal= {arXiv preprint arXiv:cond-mat/9705089},
year = {2009}
}
Comments
LaTeX, 5 pages, 2style files included, 4 embedded EPS figures, submitted to J.Phys.:Condens.Matter