Spin Resonance in the d-Wave Superconductor CeCoIn5

C. Stock, C. Broholm, J. Hudis, H. J. Kang, and C. Petrovic
Phys. Rev. Lett. 100, 087001 – Published 28 February 2008

Abstract

Neutron scattering is used to probe antiferromagnetic spin fluctuations in the d-wave heavy fermion superconductor CeCoIn5 (Tc=2.3K). Superconductivity develops from a state with slow (Γ=0.3±0.15meV) 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 (Γ<0.07meV) at ω=0.60±0.03meV 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).

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  • Received 12 March 2007

DOI:https://doi.org/10.1103/PhysRevLett.100.087001

©2008 American Physical Society

Authors & Affiliations

C. Stock1, C. Broholm1,2, J. Hudis1, H. J. Kang2, and C. Petrovic3

  • 1Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland USA 21218
  • 2NIST Center for Neutron Research, Gaithersburg, Maryland USA 20899
  • 3Condensed Matter Physics, Brookhaven National Laboratory, Upton, New York, USA 11973

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Issue

Vol. 100, Iss. 8 — 29 February 2008

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