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In situ study on the superconducting transition and internal friction of the high Tc superconductor YBa2Cu3O7−δ

The resistance, internal friction and Young's modulus of the high Tc superconductor YBa 2 Cu 2 O 7− δ were measured in situ in 80-300 K. Two obvious peaks of internal friction were observed near T c . On account of the character of the peaks, it is suggested that these two peaks are associated with the electronic relaxation between Cu 3+ and Cu 2+ . The peak and anomalies of Young's modulus observed in the range between 160 K and 280 K may be related to the adjustment of the deficiency of oxygen