THE EFFECTIVE INTERFACE POTENTIAL FOR A SUPERCONDUCTING LAYER

The effective interface potential is derived fbr a superconducting lay er attached to a wall. The expression applies to the neighborhood of a continuous wetting or delocalization transition, which exists for typ e I superconductors with a negative extrapolation length. From this po tential a number of Features can be easily derived, such as the locus of the phase transition and the critical exponents. Whereas the order parameter exponent is universal, other exponents, like the susceptibil ity exponent, are not.