Anisotropy of upper critical field for high temperature superconductors

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• 作者：Matsueda ; Hiroaki ; Sakai ; Lui ; Takanaka ; Kenji
• 关键词：Anisotropic upper critical field ; Anisotropic Fermi surface ; Pairing symmetry
• 刊名：Physica B
• 出版年：2003
• 期刊代码：53_09214526
• 类别：ph
• 出版时间：May, 2003
• 卷：329-333
• 期：Part 2
• 页码：1465-1466
• 文件大小：97.6 K

摘要

The anisotropy of high T_c superconductors arises both from the coupling constant and the Fermi surface in the Ginzburg–Landau framework. The anisotropy of the former is expressed by d_x²−y² symmetry. The shapes of the Fermi surface of high T_c superconductors are various and depend on materials and doping ratio. In this paper, we study the anisotropy of the upper critical field H_c2 in the ab plane with d_x²−y² symmetry and with typical shapes of the Fermi surface.