Spin resonance in the d-wave superconductor CeCoIn5
Embargo until
Date
2008-02-29
Journal Title
Journal ISSN
Volume Title
Publisher
American Physical Society
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).
Description
Keywords
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, antiferromagnetism, spectral weight, low-energy transfers, f-electron magnetism, d-wave gap order parameter
Citation
Physical Review Letters 29 Feb. 2008, vol.100, no.8, pp. 087001-1-4