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

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 () and Pengcheng Dai ()
Additional contact information
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
B. D. White: University of California, San Diego
Sooyoung Jang: Materials Science and Engineering Program, University of California, San Diego
Duygu Yazici: Materials Science and Engineering Program, University of California, San Diego
L. Shu: State Key Laboratory of Surface Physics, Fudan University
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
Dirk K. Morr: University of Illinois at Chicago
Pengcheng Dai: Rice University

Nature Communications, 2016, vol. 7, issue 1, 1-10

Abstract: 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.

Date: 2016
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DOI: 10.1038/ncomms12774

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