Abstract
Ultrasonic studies at 85 kHz about the T c region of melt-textured YBa 2Cu 3O 7− δ (Y123) yielded details of strain amplitude dependent (SAD) and time dependent phenomena. This has provided strong evidence for an oxygen pairing process associated with a structural change, which was evident for temperatures below T c up to 130 K. This pairing process has been linked, through a variety of experiments, to superconductivity and has provided evidence for the pseudogap phenomenon as well as a possible mechanism for channeling the superconducting carriers. The experiments included an enhanced oxygen related ultrasonic breakaway process in the T c region, lowering the T c of Y123 ultrasonically at high strain amplitudes, enhancing superconductivity at low ultrasonic strain amplitudes in the T c transition, oxygen pairing up to 130 K.
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