Fig. 5: Superconducting properties in in-plane and out-of-plane magnetic fields.

a Resistance curves of Vicinal#1 in in-plane magnetic fields of B = 0, 1, 2, 3, 4 and 5 T. b Resistance curves of Vicinal#1 in out-of-plane magnetic fields of B = 0, 0.02, 0.1, 0.15, 0.2, 0.25, 0.3 and 0.5 T. The insets of (a) and (b) show the directions of the magnetic fields with respect to the samples. The samples were patterned in a shape suitable for four-terminal measurements, as represented by areas coloured in light blue. I⁺⁽⁻⁾ and V⁺⁽⁻⁾ are the current and voltage terminals, respectively. c Field dependence of T_c in in-plane magnetic fields. d Field dependence of T_c in out-of-plane magnetic fields. The dotted curves in (c) and (d) are the quadratic and linear functions fitted to the data. e Comparison of B_c2∥ and B_c2⊥. For clarity, B_c2⊥ is scaled by a factor of 10. The dotted curves are the universal function Eq. (1) plotted with parameters determined from the fitting analyses. The dashed horizontal line indicates the enhancement factor \(\sqrt{2}\) for static locking effect of Rashba-type SOC. The relatively large variation in the fitting curves for B_c2∥ originates mainly from the angular error of the sample orientation denoted by θ_e in the main text.