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Monte Carlo study of oxygen ordering processes in YBa2Cu3O7-x

The order-disorder phase transition which occurs in YBa2Cu3O7-x is studied by the Monte Carlo method. The results are in agreement with those obtained by the modified cluster variation method. At x<0.5 and low temperatures the phase described by the reduced wavevector (1/3, 0, 0) is obtained on the phase diagram. The problem of establishing thermodynamic equilibrium in this system is also discussed.