Specific heat of ad-wave superconductor stabilized by antiferromagnetic fluctuations

We have calculated the jump and the slope of the specific heat of an antiferromagnetically stabilized d-wave superconductor. We find that in the Bardeen-Cooper-Schrieffer (BCS) limit, near $T_c$, all thermodynamics are independent of the anisotropy parameter g. Numerical evaluation as well as approximate analytic formulas show that the strong-coupling corrections to the thermodynamic properties are enhanced over the g=1 s-wave case and that the specific heat jump can get large and sharp compared to BCS theory. Functional derivatives are employed to show explicitly that the low-frequency spin fluctuations are particularly effective in increasing the jump.