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dc.contributor.authorRao, C N R-
dc.contributor.authorNagarajan, R-
dc.contributor.authorGanguli, A K-
dc.contributor.authorSubbanna, G N-
dc.contributor.authorBhat, S V-
dc.identifier.citationPhysical Review B 42(10), 6765-6768 (1990)en_US
dc.descriptionRestricted Accessen_US
dc.description.abstractBased on electron microscopy, nonresonant microwave absorption, electron paramagnetic resonance, and other studies, it is shown that in the YBa2Cu3O7-δ system, compositions with δ=0.0– 0.20, 0.25, and 0.5 are stable and monophasic, the last two being associated with ordered-oxygen-vacancy structures. The δ=0.3–0.4 region (Tc∼60 K) is not associated with an ordered-vacancy structure. More importantly, compositions in this region undergo structural changes on annealing at relatively low tempertures, eventually decomposing to the more stable phases. It appears that compositions such as YBa2Cu3O6.7 are not thermodynamically stable, casting thereby some doubt on the belief that the 60-K regime represents a genuine single-phase superconducting material.en_US
dc.publisherAmerican Physical Societyen_US
dc.rights© 1990 The American Physical Societyen_US
dc.subject60-K superconducting phaseen_US
dc.subjectordered-oxygen-vacancy structuresen_US
dc.titleNature and stability of the ‘‘60-K superconducting phase’’ in the YBa2Cu3O7-δ systemen_US
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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