ISSN:
1434-6036
Keywords:
74.20.-z
;
74.40.+k
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract The coupling of two different types of soft modes related to interaction-generated superconducting and disorder-generated (pseudo)diffusive fluctuations in the large negative-U Hubbard model with random local energies is studied in the framework of a Grassmann field theoretic approach with modified semionic Matsubara frequencies. In leading loop order it is found that the sound-like order parameter phase fluctuation mode retains its massless nature with only its velocity being modified, as expected from the generalized Ward identity. The disorder-induced fluctuations which are originally completely local due to the locality of disorder correlations acquire true diffusive behaviour by interaction effects in the superconducting phase.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01316847
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