Electronic structure of the BaA 1- xB xO 3 (A, B = Pb, Bi, Sn, Sb) alloy systems : Implications for superconductivity

Abstract

Coherent potential approximation studies of the electronic structure of the BaA 1- x B x O 3 (where A and B are different combinations of the elements Pb, Bi, Sn and Sb) alloy systems have been performed with accurate tight-binding hamiltonians. The calculations show how semiconducting BaSnO 3 evolves into a metal upon alloying with Sb or Bi. Common characteristics of the densities of states are pointed out. Using the rigid muffin-tin approximation an analysis of the superconducting properties is given.