Pseudogap phase formation in the crossover from Bose-Einstein condensation to BCS superconductivity |
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Authors: | V P Gusynin V M Loktev S G Sharapov |
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Institution: | (1) Bogolyubov Institute for Theoretical Physics, 252143 Kiev, Ukraine;(2) Department of Physics, University of Pretoria, 0002 Pretoria, South Africa |
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Abstract: | A phase diagram for a 2D metal with variable carrier density has been derived. It consists of a normal phase, where the order
parameter is absent: a so-called “abnormal normal” phase where this parameter is also absent but the mean number of composite
bosons (bound pairs) exceeds the mean number of free fermions; a pseudogap phase where the absolute value of the order parameter
gradually increases but its phase is a random value, and finally a superconducting (here Berezinskii-Kosterlitz-Thouless)
phase. The characteristic transition temperatures between these phases are found. The chemical potential and paramagnetic
susceptibility behavior as functions of the fermion density and the temperature are also studied. An attempt is made to qualitatively
compare the resulting phase diagram with the features of underdoped high-T
c
superconducting compounds above their critical temperature.
Zh. éksp. Teor. Fiz. 115, 1243–1262 (April 1999)
Published in English in the original Russian journal. Reproduced here with stylistic changes by the Translation Editor |
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