GAP ANISOTROPY AND VAN HOVE SINGULARITIES IN HIGH-T-C SUPERCONDUCTORS

被引：36

作者：

BOUVIER, J

BOK, J

机构：

[1] Laboratoire de Physique, Solide UPR 5 CNRS, ESPCI, 75231 Paris cedex 05, 10, rue Vauquelin

来源：

PHYSICA C | 1995年 / 249卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(95)00294-4

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We compute the superconducting gap Delta(k) using a simple band structure of the CuO2 planes in the high-T-c materials. We suppose that for maximum T-c, the van Hove singularities lie close to the Fermi level as is confirmed by many photoemission experiments. We use a electron-phonon interaction with weak screening; we find a strong gap anisotropy. For Bi 2212, Delta is maximum along the 001 and 010 directions with values of the order of 22 meV and minimum along 011 with a value of 6 meV. These values are in agreement with experiments.

引用

页码：117 / 122

页数：6

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