Spin Resonance in Three-Dimensional Superconductors: The Case of CeCoIn5
A. V. Chubukov, L. P. Gor’kov
DOI 10.1103/PhysRevLett.101.147004 · Physical Review Letters
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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 [C. Stock et al., Phys. Rev. Lett. 100, 087001 (2008)] 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.3 | Pressure not reported | onset |
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