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Thermodynammics of oxygen-vacancy ordering in YBa 2Cu 3O z

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Original languageEnglish
Pages (from-to)598-601
JournalPHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
Volume153
DOIs
Publication statusPublished - 1 Jun 1988

Abstract

The ordering in the Cu sbnd O basal plane of YBa 2Cu 3O z is investigated as a function of oxygen content and temperature. Several phase diagrams are calculated by means of the Cluster Variation Method applied to asymmetric two-dimensional Ising models. The interaction parameters selected guarantee the stability of the orthorhombic structures near z=7, and, for certain choices, also include a double-cell phase around z=6.5. O sbnd Cu sbnd O correlations are investigated as a function of temperature and concentrations. Calculated orthorhombic to tetragonal transition temperatures and concentrations for various oxygen partial pressures are in excellent agreement with recent experimental data.

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