Abstract
We have calculated simple approximate expressions for the normalized specific-heat difference between superconducting (S) and normal (N) states at and below T/sub c/ and for the ratio ..gamma..T/sub c//sup 2//H/sub c//sup 2/(0), using a square-well model for the gap. While our approach is very different, the formulas obtained have the same general form as those that have already appeared in the literature. Each contains two parameters, which we determine through a phenomenological fit to exact numerical results from Eliashberg theory. The strong-coupling variable is T/sub c//..omega../sub ln/, where ..omega../sub ln/ is the Allen-Dynes expression for the average phonon energy.
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