Nonuniversal Critical Behavior along the λ-line of 4He

Abstract
An accurate representation of the renormalization-group (RG) β-function of the Ginzburg-Landau Hamiltoian is given. The nonuniversal parameters of the theory are determined from a few data points of the specific heat above Tλ. Application to the specific heat below Tλ and to the Landau-Placzek ratio of scattered light explains the measured nonuniversal temperature and pressure dependence of these quantities without adjustable parameters.

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