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- W3099367032 abstract "Abstract 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 CeCoIn 5 , its SRM defies expectations for a spin-excitonic bound state, and is not a manifestation of sign-changing superconductivity. Instead, the SRM in CeCoIn 5 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." @default.
- W3099367032 created "2020-11-23" @default.
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- W3099367032 date "2020-05-29" @default.
- W3099367032 modified "2023-10-17" @default.
- W3099367032 title "Nature of the spin resonance mode in CeCoIn5" @default.
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- W3099367032 doi "https://doi.org/10.1038/s42005-020-0365-8" @default.
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- W3099367032 hasPublicationYear "2020" @default.
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