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000877404 1001_ $$0P:(DE-HGF)0$$aSong, Yu$$b0
000877404 245__ $$aNature of the spin resonance mode in CeCoIn5
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000877404 520__ $$aSpin-fluctuation-mediated unconventional superconductivity can emerge at the border of magnetism, featuring a superconducting order parameter that changes sign in momentum space. Detection of such a sign-change is experimentally challenging, since most probes are not phase-sensitive. The observation of a spin resonance mode (SRM) from inelastic neutron scattering is often seen as strong phase-sensitive evidence for a sign-changing superconducting order parameter, by assuming the SRM is a spin-excitonic bound state. Here we show that for the heavy fermion superconductor CeCoIn5, its SRM defies expectations for a spin-excitonic bound state, and is not a manifestation of sign-changing superconductivity. Instead, the SRM in CeCoIn5 likely arises from a reduction of damping to a magnon-like mode in the superconducting state, due to its proximity to magnetic quantum criticality. Our findings emphasize the need for more stringent tests of whether SRMs are spin-excitonic, when using their presence to evidence sign-changing superconductivity.
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000877404 7001_ $$0P:(DE-HGF)0$$aWang, Weiyi$$b1
000877404 7001_ $$0P:(DE-HGF)0$$aS. Van Dyke, John$$b2
000877404 7001_ $$0P:(DE-HGF)0$$aPouse, Naveen$$b3
000877404 7001_ $$0P:(DE-HGF)0$$aRan, Sheng$$b4
000877404 7001_ $$0P:(DE-HGF)0$$aYazici, Duygu$$b5
000877404 7001_ $$0P:(DE-Juel1)156579$$aSchneidewind, A.$$b6
000877404 7001_ $$0P:(DE-Juel1)159141$$aCermak, Petr$$b7
000877404 7001_ $$0P:(DE-HGF)0$$aQiu, Y.$$b8
000877404 7001_ $$0P:(DE-HGF)0$$aMaple, M. B.$$b9
000877404 7001_ $$00000-0003-3692-2835$$aMorr, Dirk K.$$b10
000877404 7001_ $$0P:(DE-HGF)0$$aDai, Pengcheng$$b11$$eCorresponding author
000877404 773__ $$0PERI:(DE-600)2921913-9$$a10.1038/s42005-020-0365-8$$gVol. 3, no. 1, p. 98$$n1$$p98$$tCommunications Physics$$v3$$x2399-3650$$y2020
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