Measurement of the Fermi Velocity in Single-Crystal Films of Lead by Electron Tunneling

This is the authors' abstract. We don't add key points for this paper.

The authors have successfully exploited the Tomasch effect in quasiparticle tunneling from thick, superconducting, single-crystal Pb films to measure Fermi velocities in three high-symmetry directions. Multiple gaps were observed in all of these directions which agree with those reported earlier in bulk single-crystal studies, indicating that these films behave in a fashion similar to bulk Pb.