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Effect of randomness on superconductivity and CDWin the (hard‐core) boson‐fermion model
Author(s) -
Pawłowski G.,
Robaszkiewicz S.
Publication year - 2003
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200301689
Subject(s) - superconductivity , randomness , condensed matter physics , physics , fermion , anderson impurity model , boson , diagonal , electron , impurity , quantum mechanics , mathematics , statistics , geometry
We discuss the influence of diagonal disorder (random site energy) on superconductivity (SC) and charge orderings (CDW) in a system of coexisting itinerant electrons and local pairs, described by the (hard‐core) boson‐fermion model. The evolution of the ground state properties and critical temperatures with increasing disorder is analysed. One finds that both the SC and the CDW can be substantially suppressed by the disorder effects. This is in obvious contrast with the s‐wave BCS superconductors which, according to the Anderson's theorem, are rather insensitive to the diagonal disorder (i.e. to nonmagnetic impurities).