Physics – Condensed Matter – Superconductivity
Scientific paper
2001-02-13
Physica A 295, 425 (2001)
Physics
Condensed Matter
Superconductivity
16 pages, 4 PS figures which you can see with gsview, ms in LaTex. Accepted in Physica A
Scientific paper
10.1016/S0378-4371(01)00139-X
A two-dimensional (2D) assembly of noninteracting, temperature-dependent, composite-boson Cooper pairs (CPs) in chemical and thermal equilibrium with unpaired fermions is examined in a binary boson-fermion statistical model as the superconducting singularity temperature is approached from above. The model is derived from {\it first principles} for the BCS model interfermion interaction from three extrema of the system Helmholtz free energy (subject to constant pairable-fermion number) with respect to: a) the pairable-fermion distribution function; b) the number of excited (bosonic) CPs, i.e., with nonzero total momenta--usually ignored in BCS theory--and with the appropriate (linear, as opposed to quadratic) dispersion relation that arises from the Fermi sea; and c) the number of CPs with zero total momenta. Compared with the BCS theory condensate, higher singularity temperatures for the Bose-Einstein condensate are obtained in the binary boson-fermion mixture model which are in rough agreement with empirical critical temperatures for quasi-2D superconductors.
Casas M.
Davidson N. J.
de Llano M.
Mamedov T. A.
Puente Antonio
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