Physics – Condensed Matter – Superconductivity
Scientific paper
1997-06-27
Cond. Matter Physics (Lviv) No.11 (1997) 131
Physics
Condensed Matter
Superconductivity
49 pages, EMTeX; minor corrections
Scientific paper
This article gives a contemporary and to some extent pedagogical review of the current theoretical understanding of the formation of the superconducting state in metallic systems with a variable density of carriers. We make an attempt to describe the crossover from the Bose-Einstein condensation type (small densities) to the Bardeen-Cooper-Schrieffer one (large densities). The functional methods are used throughout the treatment. The most of the results are considered in a review form for the first time. Some of them (in particular, the possible opening of a pseudogap) are used to explain the experimental data avaliable for high-temperatures superconductors.
Loktev Vadim M.
Sharapov Sergei G.
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