Electronic structure, magnetism, and superconductivity of (formula presented)

Abstract

The electronic structure of the newly discovered superconducting perovskite (formula presented) is calculated using the LMTO method. The states near the Fermi energy are found to be dominated by (formula presented) The Stoner factor is low while the electron-phonon coupling constant is estimated to be about 0.5, which suggests that the material is a conventional type of superconductor where (formula presented) is not affected by magnetic interactions. However, the proximity of the Fermi energy to a large peak in the density of states in conjunction with the reported nonstoichiometry of the compound has consequences for the stability of the results. © 2001 The American Physical Society.