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Ultrasonic studies at 85 and 130 KHz about the T c region of melt-textured Sm123 (SmBa 2 Cu 3 O 7-δ ), Y123, Nd123 and Bi2212 with a different structure, yielded details of strain amplitude dependent and time dependent phenomena. The results can be interpreted in terms of an oxygen related pairing process associated with a minor structural change in each of...
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