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Extremely high upper critical field in BiCh2-based (Ch: S and Se) layered superconductor LaO0.5F0.5BiS2-xSex (x = 0.22 and 0.69).

ABSTRACT: Centrosymmetric compounds with local inversion symmetry breaking have tremendously interesting and intriguing physical properties. In this study, we focus on a BiCh2-based (Ch: S, Se) layered superconductor, as a system with local inversion asymmetry, because spin polarisation based on the Rashba-Dresselhaus-type spin-orbit coupling has been observed in centrosymmetric BiCh2-based LaOBiS2 systems, while the BiCh2 layer lacks local inversion symmetry. Herein, we report the existence of extremely high in-plane upper critical fields in the BiCh2-based system LaO0.5F0.5BiS2-xSex (x = 0.22 and 0.69). The superconducting states are not completely suppressed by the applied magnetic fields with strengths up to 55 T. Thus, we consider that the in-plane upper critical field is enhanced by the local inversion symmetry breaking and its layered structure. Our study will open a new pathway for the discovery of superconductors that exhibit a high upper critical field by focusing on the local inversion symmetry breaking.

SUBMITTER: Hoshi K 

PROVIDER: S-EPMC8741910 | biostudies-literature | 2022 Jan

REPOSITORIES: biostudies-literature

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Extremely high upper critical field in BiCh<sub>2</sub>-based (Ch: S and Se) layered superconductor LaO<sub>0.5</sub>F<sub>0.5</sub>BiS<sub>2-x</sub>Se<sub>x</sub> (x = 0.22 and 0.69).

Hoshi Kazuhisa K   Kurihara Ryosuke R   Goto Yosuke Y   Tokunaga Masashi M   Mizuguchi Yoshikazu Y  

Scientific reports 20220107 1

Centrosymmetric compounds with local inversion symmetry breaking have tremendously interesting and intriguing physical properties. In this study, we focus on a BiCh<sub>2</sub>-based (Ch: S, Se) layered superconductor, as a system with local inversion asymmetry, because spin polarisation based on the Rashba-Dresselhaus-type spin-orbit coupling has been observed in centrosymmetric BiCh<sub>2</sub>-based LaOBiS<sub>2</sub> systems, while the BiCh<sub>2</sub> layer lacks local inversion symmetry. H  ...[more]

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