EFFECT OF D-WAVE ENERGY-GAP SYMMETRY ON RAMAN SHIFTS

被引：70

作者：

NICOL, EJ ^{[1
]}

JIANG, C ^{[1
]}

CARBOTTE, JP ^{[1
]}

机构：

[1] MCMASTER UNIV,DEPT PHYS & ASTRON,HAMILTON L8S 4M1,ONTARIO,CANADA

来源：

PHYSICAL REVIEW B | 1993年 / 47卷 / 13期

关键词：

D O I：

10.1103/PhysRevB.47.8131

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have calculated the shift and change in width, due to superconductivity, for a q = 0 Raman-active phonon in a two-dimensional, tight-binding band structure with a d-wave pairing interaction. We find that additional structure appears in the phonon self-energy due to the van Hove singularity, which occurs in two dimensions. A more general model of a superconductor with nodes in the gap function is also examined and related to both the d-wave model and another model for layered superconductors. In contrast to the usual isotropic s-wave case where a phonon with frequency less than twice the gap value is softened and narrowed, we find softening with broadening in these models. Comparison of the anisotropic models is made with experiment.

引用

页码：8131 / 8139

页数：9

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