ELECTRONIC-STRUCTURE OF THE BAA1-XBXO3(A,B=PB,BI,SN,SB) ALLOY SYSTEMS- IMPLICATIONS FOR SUPERCONDUCTIVITY

Coherent potential approximation studies of the electronic structure o f the BaA1-xBxO3 (where A and B are different combinations of the elem ents Pb, Bi, Sn and Sb) alloy systems have been performed with accurat e tight-binding hamiltonians. The calculations show how semiconducting BaSnO3 evolves into a metal upon alloying with Sb or Bi. Common chara cteristics of the densities of states are pointed out. Using the rigid muffin-tin approximation an analysis of the superconducting propertie s is given.