Abstract
A general relation between the critical specific heat above and below a second-order phase transition is derived. It is expressed in terms of the effective four-point coupling u(l) of the Ginzburg-Landau Hamiltonian and is valid in the entire region between asymptotic criticality and noncritical background behavior. Application to the lambda transition of /sup 4/He yields excellent agreement with the fixed-point value u( = u(0) predicted by high-order perturbation theory.
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