Figure 11.

Penetration depth as a function of the Nb film thickness. Values have been calculated by using both Eq. (3), with κ = 2.2 (spheres), and Eq. (4) valid in the dirty limit (triangles). Shown data refer to films having width w = 10 μm (blue) or w = 50 μm (red). Squares: values measured by Gubin et al.²². Dash and dotted lines delimit the range of λ variation (for the case w = 50 μm), for κ varied between 1 (bottom line) and 20 (top line) in Eq. (3). Continuous lines are guides for the eyes.