High-temperature superconductivity in oxides
Abstract
The common structural feature of oxide superconductors is the presence of M-O chains which are linear or nearly so. In addition, mixed valency and high covalency are key factors for high-temperature superconductivity in both the BaPb(1-x)Bi(x)O3 system and the new oxide superconductors based on copper. The disproportionation reactions of Bi(IV) and Cu(II) are especially crucial. Highly electropositive cations, such as Ba(2+), are required to sufficiently stabilize oxygen 2p levels so that the Cu(III) and Bi(V) states can in turn be stabilized. High-temperature superconductors are normally expected to be metastable materials; the evidence for metastability in these oxide superconductors is presented.
- Publication:
-
Chemistry of High-Temperature Superconductors
- Pub Date:
- 1987
- Bibcode:
- 1987chts.proc....2S
- Keywords:
-
- High Temperature Superconductors;
- Mixed Oxides;
- Superconductivity;
- Barium Oxides;
- Bismuth Oxides;
- Lead Oxides;
- Solid-State Physics