GAP ANISOTROPY AND CRITICAL-TEMPERATURE OF ANISOTROPIC SUPERCONDUCTORS

被引:27
作者
COMBESCOT, R [1 ]
机构
[1] UNIV PARIS 06, F-75231 PARIS 05, FRANCE
关键词
D O I
10.1103/PhysRevLett.67.148
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We study the gap anisotropy and critical temperature of superconductors within Eliashberg theory. We consider a general anisotropy and spectral shape. In the attractive strong-coupling limit, we find a qualitatively new universal result: The gap becomes isotropic. This sets severe constraints on standard strong-coupling theories of high-T(c) superconductors. In the weak-coupling limit, the gap is sensitive to anisotropy. We obtain exact results for the critical temperature both in the strong-and the weak-coupling limits. We propose a simple natural interpolation in the intermediate regime.
引用
收藏
页码:148 / 151
页数:4
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