Abstract
The anelastic properties of Zn-doped ceramic YBa 2Cu 3O 6+ δ superconductors were measured and two thermally activated relaxation peaks were observed in acoustic-frequency internal friction spectrum at 100 and 110 K. The intensity of the lower-temperature peak was found to decrease rapidly upon zinc substitution while the other one remains almost unaffected. The relaxation mechanisms for the two relaxation peaks are studied and the deteriorative effect of zinc substitution on superconductivity is also discussed.
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