Journal
PHYSICAL REVIEW LETTERS
Volume 101, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.101.147004
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Funding
- NSF-DMR [0604406]
- NHMFL [DMR-9527035]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0604406] Funding Source: National Science Foundation
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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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