The gap-to- Tc ratio of a van Hove superconductor

Abstract

We give an analytical expression for the gap-to- Tc ratio (R) of a superconductor with a van Hove singularity in the density of states. Our calculation yields R in very good agreement with the results obtained numerically by S. Ratanaburi et al. [J. Supercond. 9, 485 (1996)]. © 1998 Plenum Publishing Corporation.