Figure 12.

Temperature dependence of the perpendicular critical magnetic field (H_C2⊥). For each temperature, the corresponding H_C2⊥ value has been derived as the mean value of the applied magnetic fields corresponding to 10% and 90% of the resistivity value at the saturation point (see Figure S3 in supplementary material). Lines are the least-squares fit of the data points by Eq. (5). For comparison, data of Broussard³⁸ for the H_C2⊥ of a 48 nm thick Nb film have been added to the plot. Inset: thickness dependence of $H_{C2\perp }$ at 1.6 K, for the three investigated Nb films (spheres) and for the sample of Broussard³⁸ (square) whose value, at 1.6 K, has been extrapolated by Eq. (5) from the experimental data available down to ≈6 K. The black line serve as a guide for the eyes.