Relation between transition temperature, London penetration depth and Kosterlitz-Thouless behavior in superconductors

Relations between the transition temperature Tc, the London penetration depth, the perpendicular phase correlation length, the fall of Tc with reduced thickness in thin slabs and the associated appearance of Kosterlitz-Thouless behavior are shown to follow from a model with a two-component order parameter by imposing the analogy to superfluid helium. © 1992.