| Abstract: | We analytically determine the interface delocalization (or wetting) transition phase boundary in the limit of strongly type-I superconductors. In particular, within Ginzburg–Landau theory we derive an analytic expression for the reduced surface tension,  SC/N, of a type-I superconductor. We find that the truncated expansion
(where  is the Ginzburg–Landau parameter) is so accurate in the entire type-I regime
that derivation of higher-order terms is unnecessary. We further derive an expression for the wall/superconductor interfacial tension which again proves accurate across a broad range of values. These expansions allow us to locate the low- interface delocalization phase boundary accurately, complementing previous numerical results for the wetting phase diagram. |
