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Nature of the spin resonance mode in CeCoIn(5)

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...

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Autores principales: Song, Yu, Wang, Weiyi, Van Dyke, John S., Pouse, Naveen, Ran, Sheng, Yazici, Duygu, Schneidewind, A., Čermák, Petr, Qiu, Y., Maple, M. B., Morr, Dirk K., Dai, Pengcheng
Formato: Online Artículo Texto
Lenguaje:English
Publicado: 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7919742/
https://www.ncbi.nlm.nih.gov/pubmed/33655080
http://dx.doi.org/10.1038/s42005-020-0365-8
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author Song, Yu
Wang, Weiyi
Van Dyke, John S.
Pouse, Naveen
Ran, Sheng
Yazici, Duygu
Schneidewind, A.
Čermák, Petr
Qiu, Y.
Maple, M. B.
Morr, Dirk K.
Dai, Pengcheng
author_facet Song, Yu
Wang, Weiyi
Van Dyke, John S.
Pouse, Naveen
Ran, Sheng
Yazici, Duygu
Schneidewind, A.
Čermák, Petr
Qiu, Y.
Maple, M. B.
Morr, Dirk K.
Dai, Pengcheng
author_sort Song, Yu
collection PubMed
description 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 CeCoIn(5), its SRM defies expectations for a spin-excitonic bound state, and is not a manifestation of sign-changing superconductivity. Instead, the SRM in CeCoIn(5) 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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spelling pubmed-79197422021-03-01 Nature of the spin resonance mode in CeCoIn(5) Song, Yu Wang, Weiyi Van Dyke, John S. Pouse, Naveen Ran, Sheng Yazici, Duygu Schneidewind, A. Čermák, Petr Qiu, Y. Maple, M. B. Morr, Dirk K. Dai, Pengcheng Commun Phys Article 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 CeCoIn(5), its SRM defies expectations for a spin-excitonic bound state, and is not a manifestation of sign-changing superconductivity. Instead, the SRM in CeCoIn(5) 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. 2020 /pmc/articles/PMC7919742/ /pubmed/33655080 http://dx.doi.org/10.1038/s42005-020-0365-8 Text en Reprints and permission information is available at http://www.nature.com/reprints Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Song, Yu
Wang, Weiyi
Van Dyke, John S.
Pouse, Naveen
Ran, Sheng
Yazici, Duygu
Schneidewind, A.
Čermák, Petr
Qiu, Y.
Maple, M. B.
Morr, Dirk K.
Dai, Pengcheng
Nature of the spin resonance mode in CeCoIn(5)
title Nature of the spin resonance mode in CeCoIn(5)
title_full Nature of the spin resonance mode in CeCoIn(5)
title_fullStr Nature of the spin resonance mode in CeCoIn(5)
title_full_unstemmed Nature of the spin resonance mode in CeCoIn(5)
title_short Nature of the spin resonance mode in CeCoIn(5)
title_sort nature of the spin resonance mode in cecoin(5)
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7919742/
https://www.ncbi.nlm.nih.gov/pubmed/33655080
http://dx.doi.org/10.1038/s42005-020-0365-8
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