Abstract
Ultrasonic internal-friction and velocity measurements at 85 kHz in single crystals of Bi 2Sr 2CaCu 2O have provided evidence for the occurence of a phase change at 165 K and for two further internal-friction mechanisms which occur between this temperature and 80 K. Quantitative measurements have closely fitted a relaxation-defect concentration model we have developed. This model is further supported by slow temperature-cycling and quenching experiments which yield an activation energy of approximately 24±2 meV associated with the relaxation process.
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