Applied Physics Letters · 1987 · 77 citations · 7 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsCrystal StructureSolid State PhysicsHigh-temperature MaterialsMagnetism In SolidsOrder-disorder ThermodynamicsStrongly Correlated Electron SystemsSuperconducting MaterialsThermal Properties Of MaterialsCuprate SuperconductorsHeat Treatment EffectsHigh-temperature SuperconductivityHigh-temperature SuperconductorsOxygen VacanciesOxygen Vacancies In Metal OxidesSuperconducting Critical TemperatureSuperconducting Properties
We report the effects of heat treatment and ambient on the structure and superconducting properties of Y1Ba2Cu3O9−x. The structure undergoes an orthorhombic-to-tetragonal transition on heating at about 700 °C, caused by oxygen loss and disordering of oxygen vacancies on the copper plane between the barium layers. Heat treatments that promote maximum ordering of the oxygen vacancies result in superior superconducting properties.
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Structure of the single-phase high-temperature superconductor YBa2Cu3O7−δ
Mark A. Beno, L. Soderholm, D. W. Capone et al. · Applied Physics Letters · 1987 · 665 citations