H. Chamati et Ns. Tonchev, FINITE-SIZE SHIFT OF THE CRITICAL-TEMPERATURE IN THE SPHERICAL MODEL, Journal of statistical physics, 83(5-6), 1996, pp. 1211-1218
The finite-size shift of the critical temperature is calculated by the
example of the spherical model, with short- and long-range interactio
ns, confined to the general geometry L(d-d') x infinity(d') subject to
periodic boundary conditions. The derived formula unifies in some sen
se all results found up to now.