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We report the effects of ozone oxygenation of YBa2Cu3O7−δ thin crystals for eliminating local fluctuation in oxygen content, which is known to exist even in normal δ≊0 samples. An optimum ozone annealing condition was determined based on the microstructure and the uniformity of oxygen content of the samples. We observed the formation of fine-spacing twins running perpendicular to the original twins at thin areas and attributed this to accommodating the local strain due to oxygen uptake during ozone annealing.
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Zhu et al. (1993) studied this question.
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