Effective Mass of Bound and Resonant Two-Electron Pairs in a Simple Cubic Lattice

Abstract

A good candidate for mechanism of high temperature superconductivity (HTS) is the Bose condensation of tightly bound pairs. Thus the properties of single pair are a good starting point for investigations of HTS in the strong coupling limit. An important property is the pair's ability to move, described by its e ective mass m∗. Although HTS materials are often considered two-dimensional (2D) they have in fact quasi-2D, strongly anisotropic 3D structure. There are also other strongly correlated 3D materials exhibiting superconductivity, like heavy fermion superconductors, Chevrel phases or doped BaBiO3 [1]. That warrants investigation of 3D systems. Current paper reports calculations of pair's e ective mass within tUWJ model on generic simple cubic (sc) lattice.