Extremely high upper critical field in BiCh$_2$-based (Ch: S and Se) layered superconductor LaO$_{0.5}$F$_{0.5}$BiS$_{2-x}$Se$_x$ ($x$ = 0.22 and 0.69)

Kazuhisa Hoshi; Ryosuke Kurihara; Yosuke Goto; Masashi Tokunaga; Yoshikazu Mizuguchi

doi:10.1038/s41598-021-04393-3

paper

Extremely high upper critical field in BiCh $_{2}$ -based (Ch: S and Se) layered superconductor LaO $_{0.5}$ F $_{0.5}$ BiS $_{2 - x}$ Se $_{x}$ ( $x$ = 0.22 and 0.69)

arXiv:2109.08812 · doi:10.1038/s41598-021-04393-3

Abstract

Centrosymmetric compounds with local inversion symmetry breaking have tremendously interesting and intriguing physical properties. In this study, we focus on a BiCh $_{2}$ -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 $_{2}$ -based LaOBiS $_{2}$ systems, while the BiCh $_{2}$ layer lacks local inversion symmetry. Herein, we report the existence of extremely high in-plane upper critical fields in the BiCh $_{2}$ -based system LaO $_{0.5}$ F $_{0.5}$ BiS $_{2 - x}$ Se $_{x}$ ( $x$ = 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.

arXiv comment15 pages, 6 figures, supplemental materials

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

Abstract

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Extremely high upper critical field in BiCh $_{2}$ -based (Ch: S and Se) layered superconductor LaO $_{0.5}$ F $_{0.5}$ BiS $_{2 - x}$ Se $_{x}$ ( $x$ = 0.22 and 0.69)