Abstract
The internal-friction (IF) of superconductor RBa2Cu3Oy (R=Y, Er, Ho and Dy) was measured by a torsional vibration method in the frequency range of 0.032-10Hz. IF peaks were observed in the temperature range 410-520K. The peak-temperatures were influenced by the kind of rare-earth ions in R-site as well as the measured frequencies. The relaxation process was characterized by an average activation enthalpy of H=1.17±0.05eV and a pre-exponential factor of log(τ0)=-13.0±0.5 for YBa2Cu3Oy, H=1.17±0.05eV and log(τ0)=-13.0±0.6 for ErBa2Cu3Oy, H=1.24±0.01eV and log(τ0)=-14.2±0.1 for HoBa2Cu3Oy, H=1.17±0.03eV and log(τ0)=-13.5±0.3 for DyBa2Cu3Oy, respectively. The relaxation time (τ) decreased with increasing the ionic radius of rare-earth ion in Re-site. The activation enthalpy, however, was little affected by the ionic radius of R-site cation in RBa2Cu3Oy.
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