The self-consistent equations, which have been derived recently as a microscopic model for the crossover between BCS superconductivity and Bose-Einstein condensation in a three-dimensional interacting Fermi system &LSQB;R. Hausmann, Z Phys B 91, 291, (1993)&LSQB;, are solved numerically by repeated Fourier transformation. We find a superfluid transition temperature T(c) which increases monotonically with increasing attractive coupling strength. Furthermore, we determine the chemical potential &MU;, the fermion distribution function n(k), and the complex effective mass 2m(&AST;) of the fermion pairs T=T(c). The bound fermion pairs cause a power-law tail &SIM;k(-4) in n(k) for large k and behave as short-living quasi-particles in the crossover region, which is indicated by a large imaginary part of 2m(&AST;).
Bibliographical noteCopyright (1994) by the American Physical Society.
- ANOMALOUS TEMPERATURE-DEPENDENCE
- PENETRATION DEPTH