Spin resonance in three-dimensional superconductors:: The case of CeCoIn5

被引：49

作者：

Chubukov, A. V. ^{[1
]}

Gor'kov, L. P. ^{[2
]}

机构：

[1] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA

[2] Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32310 USA

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 14期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.101.147004

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The recent observation of resonance spin excitation at (1/2, 1/2, 1/2) in the superconducting state of CeCoIn(5) [C. Stock et al., Phys. Rev. Lett. 100, 087001 (2008)] was interpreted as evidence for d(x2-y2) gap symmetry, by analogy with cuprates. This is true if the resonance is a spin exciton. We argue that such a description is undermined by the three dimensionality of CeCoIn5. We show that in 3D systems the excitonic resonance only emerges at strong coupling, and is weak. We argue in favor of the alternative, magnon scenario, which does not require a d(x2-y2) gap.

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