Abstract
Temperature dependencies of acoustic lossesQ −1 and of relative sound velocity change Δv/v in YBa2Cu3O7−δ up to ∼60 K are calculated by the tunneling model theory. The tunneling systems are related to the off-centered positions of the apical oxygen atoms O(A) and are described through the pseudo-Jahn-Teller effect. Tunneling systems' parameters are distributed in narrow range of values and are in correspondence with the experimentally observed infrared phonon spectra and thermal ellipsoids of O(A). Respective relaxation times are calculated by the adapted reaction rate method. The calculatedQ −1(T) and Δv(T)/v dependencies are in good agreement with the experimental data, which is an additional support to the conclusion about the existence of tunneling systems in YBa2Cu3O7−δ due to the pseudo Jahn-Teller effect.
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