Possible coexistence of charge density wave and superconductivity and enhancement of the transition temperature for the layered quasi-two-dimensional superconductor 2H-NbSe2

Abstract

Starting with a two-band Hamiltonian with pairing interaction and interband coupling, and a charge density wave (CDW) Hamiltonian using Green’s function formalism, we demonstrate possible coexistence of superconductivity and charge density wave (CDW). The enhancement of the critical temperature with multi-band system is also established. The results are in broad agreement with experimental observations.