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Abstract
A two-dimensional model describing the oxygen ordering in the CuO 1–δ basal plane of YBa 2 Cu 3 O 7–δ is studied using the molecular-dynamics technique. We report the evolution of the system with δ = 0.5 and δ = 0.3 quenched from OI to OII phase and from tetragonal to OII phase. Depending on the oxygen concentration, annealing of quenched OI phase leads either to the formation of OII precipitates within OI phase or antiphase domains of OII phase.