Journal
SCIENTIFIC REPORTS
Volume 12, Issue 1, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41598-021-04393-3
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Funding
- Japanese Society for the Promotion of Science (JSPS)
- KAKENHI [JP20J21627, 18KK0076]
- Tokyo Metropolitan Government Advanced Research [H31-1]
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In this study, the existence of extremely high in-plane upper critical fields in the BiCh(2)-based system LaO0.5F0.5BiS2-xSex (x=0.22 and 0.69) is reported. It is suggested that the enhancement of the in-plane upper critical field is due to the local inversion symmetry breaking and the layered structure.
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 LaOBiS2 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 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.
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