The Nature of Superconductivity in Ba1-XKXBiO3
| Autor: | D.G. Hinks |
|---|---|
| Rok vydání: | 1990 |
| Předmět: |
Superconductivity
Materials science Condensed matter physics Magnetism Orbital hybridisation Fermi level Fermi surface Electronic structure Cubic crystal system Condensed Matter Physics Condensed Matter::Materials Science symbols.namesake Condensed Matter::Superconductivity symbols Condensed Matter::Strongly Correlated Electrons General Materials Science Physical and Theoretical Chemistry Electronic band structure |
| Zdroj: | MRS Bulletin. 15:55-59 |
| ISSN: | 1938-1425 0883-7694 |
| Popis: | Superconductivity in potassium-doped BaBiO3 was first observed by Mattheiss et al. in 1988 and the structure of the superconducting material was determined by Cava et al. The material crystallizes in a simple perovskite structure with potassium substituted on the barium site as shown in Figure 1. Unlike the layered copper-oxide materials, this compound is simple cubic and thus isotropic in the superconducting state and shows no magnetism. Band theory calculations show that the electronic structure is simple, with conduction bands composed of Bi(sp)O(p) hybridized orbitals and, unlike the copper-oxide materials, there are no d electrons at the Fermi surface or involved in the superconductivity. Photoemission and inverse-photoemission agree well with the theoretical calculations and show metallic behavior with a low density of states at the Fermi level consisting of Bi-O sp hybrids. This material is structurally and electronically simple compared to the copper-oxide compounds and, therefore, should be much easier to investigate experimentally and understand theoretically. This article discusses recent results concerning the structural properties of the material and describes several experiments that give information on the superconducting state. |
| Databáze: | OpenAIRE |
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