Figure 4
Huge upper critical field for locally non-centrosymmetric superconductor LaO0.5F0.5BiS2−xSex (x = 0.22 and 0.69). (a,b) Upper critical field as a function of temperature for x = 0.22 (a) and 0.69 (b). Red and blue circles show the \({B}_{\text{c}2}^{\parallel }\left(T\right)\) by static field and pulsed field, respectively. We added the error bars to the blue circles as it is possible for the applied field to slightly deviate from the ab plane owing to the lack of rotator measurements. Additionally, there is uncertainty related to the stability of temperature. Red squares show the \({B}_{\text{c}2}^{\perp }(T)\) by the static field. The black dashed curves show the Werthamer–Helfand–Hohenberg (WHH) fits. Black diamonds denote the Pauli limit. The insets show magnified views of the low-field region for \({B}_{\text{c}2}^{\perp }(T)\). Black solid lines show linear fits.
