Abstract
The crossover between the Cooper-pair condensation and the Bose-Einstein condensation of di-electronic molecules in quasi-two dimensional superconductors is investigated on the basis of the Nozieres and Schmitt-Rink theory from a general point of view. By using this formalism we calculate directly thermodynamic quantities and develop further the theory by Tokumitu et al. Through the study we find that the T -linear coefficient of the electronic specific heat γ( T ) decreases with decreasing temperature above T c for sufficiently strong coupling interaction. This pseudo-gap behavior in the electronic specific heat coefficient is confirmed by using the t -matrix approximation in Luttinger's theory.
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