Anisotropic electron coupling as a phenomenological model for highT_{c} superconductors
Abstract
A threedimensional weak coupling BCS model with an anisotropic pairing interaction in momentum space is reported. It exhibits an anisotropic gap in accord with recent experimental observations for highT_{c} oxides. The gap ratio 2Δ/k_{B}T_{c} is calculated as a function of the anisotropy ratio of the electron pairing. It is found that the mean gap ratio decreases with increasing anisotropy of the electron pairing, whereas the maximum gap ratio increases. Assuming a unique strength of the effective electron interaction the transition temperature turns out to be always larger than in the isotropic case. The temperature dependence of the gap in the CuO plane and along the c axis of YBaCuO is presented.
 Publication:

Physical Review B
 Pub Date:
 August 1993
 DOI:
 10.1103/PhysRevB.48.4176
 arXiv:
 arXiv:condmat/9305009
 Bibcode:
 1993PhRvB..48.4176L
 Keywords:

 74.20.Fg;
 74.72.h;
 BCS theory and its development;
 Cuprate superconductors;
 Condensed Matter
 EPrint:
 13 LaTex pages using RevTex (3 figures available on request), UNITUETHEP61993