Journal Article

FZJ-2020-02173

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Nature of the spin resonance mode in CeCoIn5

Song, Y. ; Wang, W. ; S. Van Dyke, J. ; Pouse, N. ; Ran, S. ; Yazici, D. ; Schneidewind, A.FZJ* ; Cermak, P. ; Qiu, Y. ; Maple, M. B. ; Morr, D. K. ; Dai, P. (Corresponding author)

2020
Springer Nature London

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Please use a persistent id in citations: http://hdl.handle.net/2128/25049  doi:10.1038/s42005-020-0365-8

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 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.

Keyword(s): Magnetic Materials (1st) ; Condensed Matter Physics (2nd) ; Magnetism (2nd)

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Contributing Institute(s):

1. JCNS-FRM-II (JCNS-FRM-II)
2. Streumethoden (JCNS-2)
3. Heinz Maier-Leibnitz Zentrum (MLZ)

Research Program(s):

1. 6G15 - FRM II / MLZ (POF3-6G15) (POF3-6G15)
2. 6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623) (POF3-623)

Experiment(s):

1. PANDA: Cold three axes spectrometer (SR2)

Appears in the scientific report 2020

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