Feedback Spin Resonance in Superconducting CeCu2Si2 and CeCoIn5

被引：84

作者：

Eremin, I. ^{[1
,2
]}

Zwicknagl, G. ^{[2
]}

Thalmeier, P. ^{[3
]}

Fulde, P. ^{[1
]}

机构：

[1] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany

[2] Tech Univ Carolo Wilhelmina Braunschweig, Inst Math Phys, D-38106 Braunschweig, Germany

[3] Max Planck Inst Chem Phys Fester Stoffe, D-01187 Dresden, Germany

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 18期

关键词：

D O I：

10.1103/PhysRevLett.101.187001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We show that the recently observed spin resonance modes in heavy-fermion superconductors CeCoIn5 and CeCu2Si2 are magnetic excitons originating from superconducting quasiparticles. The wave vector Q of the resonance state leads to a powerful criterion for the symmetry and node positions of the unconventional gap function. The detailed analysis of the superconducting feedback on magnetic excitations reveals that the symmetry of the superconducting gap corresponds to a singlet d(x)(2)-y(2) state symmetry in both compounds. In particular this resolves the long-standing ambiguity of the gap symmetry in CeCoIn5. We demonstrate that in both superconductors the resonance peak shows a significant dispersion away from Q which can be checked experimentally. Our analysis reveals the similar origin of the resonance peaks in the two heavy-fermion superconductors and in layered cuprates.

引用

页数：4

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