The correlation of superconducting properties of Ba 2 YCu 3 O 7- y to the oxygen deficiency y has been investigated using samples quenched in different temperatures in air. The magnitude of the superconducting diamagnetism at 77 K rapidly decreases with increasing y . The variations of T c and Δ T c (transition width) are presented and discussed in terms of the occupancy and distribution of oxygen atoms in the Cu layer between the Ba layers.
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Nozaki et al. (1987) studied this question.
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