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VOLUME 58 (1993) | ISSUE 11 | PAGE 889
Polaron conductivity mechanism in PrBa2Cu3O6.9
The temperature dependence of the ac conductivity σ=σ0+σ(ω) of a PrBa2Cu306.9 sample at low frequencies has been studied. The term σ (ω ) has an anomalous temperature dependence at low temperatures. The feature observed is due to a polaron conductivity mechanism.