Hauptseite > Publikationsdatenbank > Nature of the spin resonance mode in CeCoIn5 > print

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100 1 _ |a Song, Yu
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245 _ _ |a Nature of the spin resonance mode in CeCoIn5
260 _ _ |a London
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520 _ _ |a 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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693 _ _ |a Forschungs-Neutronenquelle Heinz Maier-Leibnitz
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700 1 _ |a Wang, Weiyi
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700 1 _ |a S. Van Dyke, John
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700 1 _ |a Pouse, Naveen
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700 1 _ |a Ran, Sheng
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700 1 _ |a Yazici, Duygu
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700 1 _ |a Schneidewind, A.
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700 1 _ |a Cermak, Petr
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700 1 _ |a Qiu, Y.
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700 1 _ |a Maple, M. B.
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700 1 _ |a Morr, Dirk K.
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700 1 _ |a Dai, Pengcheng
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773 _ _ |a 10.1038/s42005-020-0365-8
|g Vol. 3, no. 1, p. 98
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