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Surface tension in the Widom model by low-temperature expansion.

The surface tension between coexisting plus and minus ferromagnetic phases of the Widom model [J. Chem. Phys. 84, 6943 (1986)] is computed by performing a seventh-order low-temperature expansion. A functional form for the surface tension is suggested, based on Pade-approximant analysis, for the complete range from T=0 to bulk criticality. The surface tension is computed along the roughening line, which had been recently calculated by a low-temperature expansion [B. Kahng, A. Berera, and K. A. Dawson, Phys. Rev. A 42, 6093 (1990)]