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Robust upward dispersion of the neutron spin resonance in the heavy fermion superconductor Ce1−xYbxCoIn5

Author

Listed:
  • Yu Song

    (Rice University)

  • John Van Dyke

    (University of Illinois at Chicago)

  • I. K. Lum

    (Materials Science and Engineering Program, University of California, San Diego
    University of California, San Diego
    Center for Advanced Nanoscience, University of California, San Diego)

  • B. D. White

    (University of California, San Diego
    Center for Advanced Nanoscience, University of California, San Diego)

  • Sooyoung Jang

    (Materials Science and Engineering Program, University of California, San Diego
    University of California, San Diego
    Center for Advanced Nanoscience, University of California, San Diego)

  • Duygu Yazici

    (Materials Science and Engineering Program, University of California, San Diego
    University of California, San Diego
    Center for Advanced Nanoscience, University of California, San Diego)

  • L. Shu

    (State Key Laboratory of Surface Physics, Fudan University
    Collaborative Innovation Center of Advanced Microstructures)

  • A. Schneidewind

    (Jülich Center for Neutron Science JCNS, Forschungszentrum Jülich GmbH, Outstation at MLZ)

  • Petr Čermák

    (Jülich Center for Neutron Science JCNS, Forschungszentrum Jülich GmbH, Outstation at MLZ)

  • Y. Qiu

    (NIST Center for Neutron Research, National Institute of Standard and Technology)

  • M. B. Maple

    (Materials Science and Engineering Program, University of California, San Diego
    University of California, San Diego
    Center for Advanced Nanoscience, University of California, San Diego)

  • Dirk K. Morr

    (University of Illinois at Chicago)

  • Pengcheng Dai

    (Rice University)

Abstract

The neutron spin resonance is a collective magnetic excitation that appears in the unconventional copper oxide, iron pnictide and heavy fermion superconductors. Although the resonance is commonly associated with a spin-exciton due to the d(s±)-wave symmetry of the superconducting order parameter, it has also been proposed to be a magnon-like excitation appearing in the superconducting state. Here we use inelastic neutron scattering to demonstrate that the resonance in the heavy fermion superconductor Ce1−xYbxCoIn5 with x=0, 0.05 and 0.3 has a ring-like upward dispersion that is robust against Yb-doping. By comparing our experimental data with a random phase approximation calculation using the electronic structure and the momentum dependence of the -wave superconducting gap determined from scanning tunnelling microscopy (STM) for CeCoIn5, we conclude that the robust upward-dispersing resonance mode in Ce1−xYbxCoIn5 is inconsistent with the downward dispersion predicted within the spin-exciton scenario.

Suggested Citation

  • Yu Song & John Van Dyke & I. K. Lum & B. D. White & Sooyoung Jang & Duygu Yazici & L. Shu & A. Schneidewind & Petr Čermák & Y. Qiu & M. B. Maple & Dirk K. Morr & Pengcheng Dai, 2016. "Robust upward dispersion of the neutron spin resonance in the heavy fermion superconductor Ce1−xYbxCoIn5," Nature Communications, Nature, vol. 7(1), pages 1-10, November.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms12774
    DOI: 10.1038/ncomms12774
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    Cited by:

    1. Mario Teixeira Parente & Georg Brandl & Christian Franz & Uwe Stuhr & Marina Ganeva & Astrid Schneidewind, 2023. "Active learning-assisted neutron spectroscopy with log-Gaussian processes," Nature Communications, Nature, vol. 14(1), pages 1-15, December.

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