Abstract
A new field-theoretical crossover equation-of-state model provides a bridge between the asymptotic behavior close to a liquid–gas critical point and the expected mean field behavior farther away. The crossover is based on the beta function for the renormalized fourth-order coupling constant and incorporates the correct asymptotic, crossover, and mean field exponents. Experimental measurements of the isothermal susceptibility, coexistence curve, and heat capacity at constant volume near the 3 He critical point compare well with the predictions of this model.
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