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

A. V. Chubukov, L. P. Gor'Kov

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Abstract

The recent observation of resonance spin excitation at (1/2, 1/2, 1/2) in the superconducting state of CeCoIn5 was interpreted as evidence for dx2-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 dx2-y2 gap.

Original languageEnglish (US)
Article number147004
JournalPhysical Review Letters
Volume101
Issue number14
DOIs
StatePublished - Oct 3 2008

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