Novel Aspect of the Critical Temperature of One-Dimensional Charge-Density-Wave Superconductors

Abstract

Role of charge density waves (CDW) on the superconducting (SC) transition temperature, T_c, in a one-dimensional model is investigated by examining the relation between the insulating gap induced by the CDW and the band filling. In contrast to the fact that the gap destroys the SC state, it is shown that the CDW formation results in the T_c enhancement due to the increase of the density of states when the gap edge exists near the Fermi point. Further the degree of the T_c enhancement is examined in the presence of the CDW fluctuation.