Spin resonance in the d-wave superconductor CeCoIn5

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Title: Spin resonance in the d-wave superconductor CeCoIn5
Author: Stock, C.; Broholm, C.; Hudis, J.; Kang, H.J.; Petrovic, C.
Abstract: Neutron scattering is used to probe antiferromagnetic spin fluctuations in the d-wave heavy fermion superconductor CeCoIn5 (Tc=2.3 K). Superconductivity develops from a state with slow (ℎΓ=0.3±0.15 meV) commensurate [Q0=(1/2,1/2,1/2)] antiferromagnetic spin fluctuations and nearly isotropic spin correlations. The characteristic wave vector in CeCoIn5 is the same as CeIn3 but differs from the incommensurate wave vector measured in antiferromagnetically ordered CeRhIn5. A sharp spin resonance (ℎΓ<0.07 meV) at ℎω=0.60±0.03 meV develops in the superconducting state removing spectral weight from low-energy transfers. The presence of a resonance peak is indicative of strong coupling between f-electron magnetism and superconductivity and consistent with a d-wave gap order parameter satisfying Δ(q+Q0)=-Δ(q).
URI: http://jhir.library.jhu.edu/handle/1774.2/33736
Date: 2008-02-29
Citation: Physical Review Letters 29 Feb. 2008, vol.100, no.8, pp. 087001-1-4
Subject: spin resonance
neutron scattering
indium alloys
heavy fermion superconductors
d-wave superconductivity
commensurate antiferromagnetic spin fluctuations
isotropic spin correlations
incommensurate wave vector
cobalt alloys
cerium alloys
spectral weight
low-energy transfers
f-electron magnetism
d-wave gap order parameter

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