The free energy per component of an isotropic one-dimensional Ginzburg-Landau field with n components is calculated to order n -2 by evaluating the appropriate Feynman graphs. The result agrees with that of Ferrell and Scalapino (1974) obtained by solving the equivalent anharmonic oscillator problem, but the method has greater generality.
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A. J. Bray (1974) studied this question.
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