Figure 6.
Superconducting transition temperature as a function of the reciprocal film thickness. Present work (SiO2 substrate: red filled circles; sapphire substrate: yellow filled circles); Zhao et al.20 (triangles); Delacour et al.21 (squares). Continuous lines are least-squares fit, using Eq. (1) (see text), of the different data sets. The effective thickness of the normal layer (in nm) is represented by the corresponding α value for each curve.