Oxygen intercalation in the perovskite superconductor YBa2Cu3O6+x

W. R. McKinnon, M. L. Post, L. S. Selwyn, G. Pleizier, J. M. Tarascon, P. Barboux, L. H. Greene, G. W. Hull

Research output: Contribution to journalArticlepeer-review

Abstract

We have studied superconductivity and the thermodynamics of oxygen insertion in the oxygen intercalation system YBa2Cu3O6+x. The superconducting transition temperature decreases as x decreases, and the transition is sharp at Tc=90 K near x=1 and at 55 K near x=0.5. The thermodynamics of oxygen intercalation at high temperatures (both isotherms and isobars), and the orthorhombic-tetragonal transition, can be explained in terms of a lattice-gas model that includes a large energy of repulsion between oxygen atoms on nearest-neighbor sites. The high-temperature behavior is also consistent with smaller interactions, some attractive, between second neighbors. Such energies are needed to explain the behavior at low temperatures.

Original languageEnglish (US)
Pages (from-to)6543-6551
Number of pages9
JournalPhysical Review B
Volume38
Issue number10
DOIs
StatePublished - 1988

ASJC Scopus subject areas

  • Condensed Matter Physics

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