Nature of the spin resonance mode in CeCoIn(5).
Nature of the spin resonance mode in CeCoIn(5).
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CeCoIn中的自旋共振模式的性质(5)。
DOI:
10.1038/s42005-020-0365-8
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发表时间:
2020
影响因子:
5.5
通讯作者:
Dai P
中科院分区:
文献类型:
--
作者:
Song Y;Wang W;Van Dyke JS;Pouse N;Ran S;Yazici D;Schneidewind A;Čermák P;Qiu Y;Maple MB;Morr DK;Dai P
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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