s+d混合波对称性下联合模型的超导电性

提出一个联合模型，在ｓ＋ｄ混合波对称性下，合并考虑电子间配对相互作用的各向异性及二维电子结构上Ｖａｎ Ｈｏｖｅ奇异性对超导电性的影响．理论结果表明：Ｖａｎ Ｈｏｖｅ奇异性及配对相互作用的各向异性都是使Ｔ_c提高的重要因素；各向异性的电子配对相互作用自然导致序参量的ｄ波成分，当此各向异性增强时，ｄ波成分也增大．高温超导体的较高２Δ（０）／ｋ_ＢＴ_c值可能预示着在这些材料中ｓ波的权重远小于ｄ波权重．联合效应模型下的Ｔ_c处比热跳跃行为与经典的ＢＣＳ理论也完全不同关键词：

A COMBINATION MODEL OF SUPERCONDUCTIVITY UNDER s+d MIXED WAVE SYMMETRY

Under the symmetry of the s+d mixed waves, a model is proposed which accounts for the combined influence of two factors on superconductivity. The first factor is the anisotropy of the pairing interaction between electrons, and the second is the Van Hove singularity in the two dimensional electronic structure. The theoretical results show that both the Van Hove singularity and the pairing interaction anisotropy are important factors to enhance Ｔ_c. The anisotropic pairing interaction naturally leads to the d-wave component. As this anisotropy strengthens, the d-wave component increases. The fairly high ratio of ２Δ（０）／ｋ_ＢＴ_c of the high-Ｔ_c superconductors may be due to the fact that the weight of the s-wave component is far smaller than the weight of the d-wave component. The specific heat jump at Ｔ_c in combination model is completely different from the classical BCS theory.