期刊
COMMUNICATIONS PHYSICS
卷 3, 期 1, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s42005-020-0365-8
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资金
- U.S. DOE, BES [DE-SC0012311]
- Robert A. Welch Foundation [C-1839]
- US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DEFG02-04-ER46105]
- US National Science Foundation [DMR-1810310]
- National Science Foundation [DMR-1508249]
Spin-fluctuation-mediated unconventional superconductivity can emerge at the border of magnetism, featuring a superconducting order parameter that changes sign in momentum space. Detection of such a sign-change is experimentally challenging, since most probes are not phase-sensitive. The observation of a spin resonance mode (SRM) from inelastic neutron scattering is often seen as strong phase-sensitive evidence for a sign-changing superconducting order parameter, by assuming the SRM is a spin-excitonic bound state. Here we show that for the heavy fermion superconductor CeCoIn5, its SRM defies expectations for a spin-excitonic bound state, and is not a manifestation of sign-changing superconductivity. Instead, the SRM in CeCoIn5 likely arises from a reduction of damping to a magnon-like mode in the superconducting state, due to its proximity to magnetic quantum criticality. Our findings emphasize the need for more stringent tests of whether SRMs are spin-excitonic, when using their presence to evidence sign-changing superconductivity.
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