Dependence of hole concentration on oxygen vacancy order in YBa2Cu3O7−δ
作者： B.W. Veal , A.P. Paulikas
DOI: 10.1016/0921-4534(91)90398-I
关键词: Electron 、 Inorganic compound 、 Yba2cu3o7 δ 、 Doping 、 Oxygen vacancy 、 Materials science 、 High-temperature superconductivity 、 Divalent 、 Valence (chemistry) 、 Analytical chemistry
摘要: Abstract Using a simple chemical model, the hole concentration is calculated for YBa 2 Cu 3 O 7−δ as function of oxygen stoichiometry δ. For calculations, it assumed that 2-coordinated monovalent while 3- and 4-coordinated Cu's are nominally divalent. Because bind more electrons than do divalent Cu's, degree doping conduction band depends on vacancy configuration. We examine extreme ordering conditions apply valence model to an extended phase field double-cell (Ortho II) structure. δ > 0.2, dependence δ, obtained (defect) structure, similar observed T c suggesting relationship between concentration. If depend quadratically (as other oxide superconductors), then versus corresponds closely with experiment. Low temperature aging behavior also simulated in model.
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