Oxygen ordering and superconductivity in La(Ba/2-x/La/x/)Cu3O(7+delta)
Abstract
A neutron powder diffraction study of a series of La(Ba/2-x/La/x/)Cu3O(7+delta) compounds has been conducted, showing that the superconducting phase is a similarly disordered isomorph of the orthorhombic YBa2Cu3O(7+delta) structure. The region of solid solubility for this compound extends from x = 0.5 (La:Ba:Cu ratios of 3:3:6) to x of about 0.25, and does not include the stoichiometric compound x = 0 (LaBa2Cu3O/7+delta/).The presence of Cu-O chains, and not just a formal copper charge state greater than two, is vital for the occurrence of superconductivity.
- Publication:
-
Nature
- Pub Date:
- September 1987
- DOI:
- Bibcode:
- 1987Natur.329..227S
- Keywords:
-
- Barium Oxides;
- Copper Oxides;
- Crystal Structure;
- Lanthanum Oxides;
- Superconductivity;
- Order-Disorder Transformations;
- Oxygen;
- Phase Transformations;
- Solid Phases;
- Transition Temperature;
- Yttrium Oxides;
- Solid-State Physics