Abstract
The internal friction in the high-Tc superconductor YBa2Cu3O7- delta arising from the diffusion of oxygen atoms between the O(1) and O(5) sites under the influence of a periodic mechanical strain is studied microscopically in the linear approximation of the relaxation process. It is analysed for various specific cases in both the tetragonal and the orthorhombic phases as well as in the case of polycrystalline samples.
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