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Influence of simultaneous substitution of Ca and Co in a YBa2Cu3O7 − δsuperconductor: Neutron structural studies

Authors
Journal
Physica B Condensed Matter
0921-4526
Publisher
Elsevier
Publication Date
Identifiers
DOI: 10.1016/0921-4526(95)00071-g

Abstract

Abstract Neutron structural study shows that partial substitution of Co for Cu in YBa 2Cu 3O 7 − δ leads to an uptake of excess oxygen in chain-layers, but causes some oxygen depletion in CuO 2 planes. Coupled Co/Ca substitution arrests uptake of excess oxygen which could be the cause of partial restoration of T c vis-à-vis the samples doped with Co only. A new feature of the doped samples is the presence of a small amount of oxygen at the (0,0,½) sites.

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