We have observed the behavior of clean superconducting thin films of tin in both parallel and perpendicular magnetic fields. The results are quantitatively consistent with an interpretation based on the Ginzburg-Landau theory. For the parallel field we have generated one-dimensional numerical solutions of their equations, while for the perpendicular field we have used a refinement of a vortex model proposed by Tinkham which is based on their expression for free energy.

• Received 18 October 1965

DOI:https://doi.org/10.1103/PhysRev.143.323