Specific heats of classical spin systems and inhomogeneous differential approximants

Abstract
Derives accurate compact expressions for the high-temperature specific heats of classical (S= infinity , 3-vector) spin systems on FCC, BCC and SC lattices for pure Heisenberg, XY and Ising-like couplings, respectively. The analysis of the appropriate series expansions demonstrates the utility of inhomogeneous differential approximants and supports the estimate alpha H=-0.21+or-0.04.