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28 March 2024
 
  » arxiv » cond-mat/0012082

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Phase Fluctuations and Pseudogap Phenomena
Vadim M. Loktev ; Rachel M. Quick ; Sergei G. Sharapov ;
Date 6 Dec 2000
Journal Phys.Rept. 349 (2001) 1-123
Subject Superconductivity; Strongly Correlated Electrons | cond-mat.supr-con cond-mat.str-el hep-ph
AbstractThis article reviews the current status of precursor superconducting phase fluctuations as a possible mechanism for pseudogap formation in high-temperature superconductors. In particular we compare this approach which relies on the two-dimensional nature of the superconductivity to the often used $T$-matrix approach. Starting from simple pairing Hamiltonians we present a broad pedagogical introduction to the BCS-Bose crossover problem. The finite temperature extension of these models naturally leads to a discussion of the Berezinskii-Kosterlitz-Thouless superconducting transition and the related phase diagram including the effects of quantum phase fluctuations and impurities. We stress the differences between simple Bose-BCS crossover theories and the current approach where one can have a large pseudogap region even at high carrier density where the Fermi surface is well-defined. The Green’s function and its associated spectral function, which explicitly show non-Fermi liquid behaviour, is constructed in the presence of vortices. Finally different mechanisms including quasi-particle-vortex and vortex-vortex interactions for the filling of the gap above $T_c$ are considered.
Source arXiv, cond-mat/0012082
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