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Internal friction due to oxygen relaxation in superconducting YBa2Cu3O7−δ above Tc

Published online by Cambridge University Press:  31 January 2011

J.R. Cost  and
J.T. Stanley
J.R. Cost
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
J.T. Stanley
Affiliation:
Arizona State University, Tempe, Arizona 85281
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Abstract

YBa2Cu3O7−δ has an internal friction peak near 210 °C measured at 1.18 Hz. The shift in the temperature of this peak with frequency as measured with different internal friction techniques indicates that the relaxation process has an average activation energy of 1.14 ± 0.05 eV and a pre-exponential factor, τ0 = 1.5 × 10−13s (log τ0 = −12.82 ± 0.23). The peak height decreases during annealing at above 375 °C in helium and increases when annealed in oxygen. The mechanism for the relaxation is believed to be the stress-induced motion of oxygen atoms in the Cu–O plane. Detailed analysis shows that the internal friction peak is determined by a spectrum of activation energies; this spectrum is a symmetrical single peak 0.12 eV wide at half-height. Models for the relaxation are considered and the resulting diffusivities are compared to tracer diffusion results.

Type
Articles
Information
Journal of Materials Research , Volume 6 , Issue 2 , February 1991 , pp. 232 - 243
Copyright
Copyright © Materials Research Society 1991

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