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 CeCoIn5likely 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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Wang, Jinghui ; Ran, Kejing ; Li, Shichao ; Ma, Zhen ; Bao, Song ; Cai, Zhengwei ; Zhang, Youtian ; Nakajima, Kenji ; Ohira-Kawamura, Seiko ; Čermák, P. ; et al ( , Nature Communications)
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Pásztorová, J. ; Howell, A. ; Songvilay, M. ; Sarte, P. M. ; Rodriguez-Rivera, J. A. ; Arévalo-López, A. M. ; Schmalzl, K. ; Schneidewind, A. ; Dunsiger, S. R. ; Singh, D. K. ; et al ( , Physical Review B)
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MacDougall, G. J. ; Aczel, A. A. ; Su, Yixi ; Schweika, W. ; Faulhaber, E. ; Schneidewind, A. ; Christianson, A. D. ; Zarestky, J. L. ; Zhou, H. D. ; Mandrus, D. ; et al ( , Physical Review B)
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Song, Yu ; Van Dyke, John ; Lum, I. K. ; White, B. D. ; Jang, Sooyoung ; Yazici, Duygu ; Shu, L. ; Schneidewind, A. ; Čermák, Petr ; Qiu, Y. ; et al ( , Nature Communications)