Possible pairing mechanism switching driven by structural symmetry breaking in BiS2-based layered superconductors

Abstract Investigation of isotope effects on superconducting transition temperature (T c) is one of the useful methods to examine whether electron–phonon interaction is essential for pairing mechanisms. The layered BiCh2-based (Ch: S, Se) superconductor family is a candidate for unconventional super...

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Autores principales:	Aichi Yamashita, Hidetomo Usui, Kazuhisa Hoshi, Yosuke Goto, Kazuhiko Kuroki, Yoshikazu Mizuguchi
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/9d1d8423f05a41e4847d223cb2165a3b
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spelling	oai:doaj.org-article:9d1d8423f05a41e4847d223cb2165a3b2021-12-02T14:07:48ZPossible pairing mechanism switching driven by structural symmetry breaking in BiS2-based layered superconductors10.1038/s41598-020-80544-22045-2322https://doaj.org/article/9d1d8423f05a41e4847d223cb2165a3b2021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-80544-2https://doaj.org/toc/2045-2322Abstract Investigation of isotope effects on superconducting transition temperature (T c) is one of the useful methods to examine whether electron–phonon interaction is essential for pairing mechanisms. The layered BiCh2-based (Ch: S, Se) superconductor family is a candidate for unconventional superconductors, because unconventional isotope effects have previously been observed in La(O,F)BiSSe and Bi4O4S3. In this study, we investigated the isotope effects of 32S and 34S in the high-pressure phase of (Sr,La)FBiS2, which has a monoclinic crystal structure and a higher T c of ~ 10 K under high pressures, and observed conventional-type isotope shifts in T c. The conventional-type isotope effects in the monoclinic phase of (Sr,La)FBiS2 are different from the unconventional isotope effects observed in La(O,F)BiSSe and Bi4O4S3, which have a tetragonal structure. The obtained results suggest that the pairing mechanisms of BiCh2-based superconductors could be switched by a structural-symmetry change in the superconducting layers induced by pressure effects.Aichi YamashitaHidetomo UsuiKazuhisa HoshiYosuke GotoKazuhiko KurokiYoshikazu MizuguchiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-7 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Aichi Yamashita Hidetomo Usui Kazuhisa Hoshi Yosuke Goto Kazuhiko Kuroki Yoshikazu Mizuguchi Possible pairing mechanism switching driven by structural symmetry breaking in BiS2-based layered superconductors
description	Abstract Investigation of isotope effects on superconducting transition temperature (T c) is one of the useful methods to examine whether electron–phonon interaction is essential for pairing mechanisms. The layered BiCh2-based (Ch: S, Se) superconductor family is a candidate for unconventional superconductors, because unconventional isotope effects have previously been observed in La(O,F)BiSSe and Bi4O4S3. In this study, we investigated the isotope effects of 32S and 34S in the high-pressure phase of (Sr,La)FBiS2, which has a monoclinic crystal structure and a higher T c of ~ 10 K under high pressures, and observed conventional-type isotope shifts in T c. The conventional-type isotope effects in the monoclinic phase of (Sr,La)FBiS2 are different from the unconventional isotope effects observed in La(O,F)BiSSe and Bi4O4S3, which have a tetragonal structure. The obtained results suggest that the pairing mechanisms of BiCh2-based superconductors could be switched by a structural-symmetry change in the superconducting layers induced by pressure effects.
format	article
author	Aichi Yamashita Hidetomo Usui Kazuhisa Hoshi Yosuke Goto Kazuhiko Kuroki Yoshikazu Mizuguchi
author_facet	Aichi Yamashita Hidetomo Usui Kazuhisa Hoshi Yosuke Goto Kazuhiko Kuroki Yoshikazu Mizuguchi
author_sort	Aichi Yamashita
title	Possible pairing mechanism switching driven by structural symmetry breaking in BiS2-based layered superconductors
title_short	Possible pairing mechanism switching driven by structural symmetry breaking in BiS2-based layered superconductors
title_full	Possible pairing mechanism switching driven by structural symmetry breaking in BiS2-based layered superconductors
title_fullStr	Possible pairing mechanism switching driven by structural symmetry breaking in BiS2-based layered superconductors
title_full_unstemmed	Possible pairing mechanism switching driven by structural symmetry breaking in BiS2-based layered superconductors
title_sort	possible pairing mechanism switching driven by structural symmetry breaking in bis2-based layered superconductors
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/9d1d8423f05a41e4847d223cb2165a3b
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Possible pairing mechanism switching driven by structural symmetry breaking in BiS2-based layered superconductors

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