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Izbizky, M. A., M. NÃºÃ±ez Regueiro, P. Esquinazi, C. Durán, and C. Fainstein. "Phonon transport in superconducting EuBa2Cu3O7-x." Physics Letters A 129, no. 1 (1988): 71–75.
Abstract: We have measured the thermal conductivity, Young modulus sound velocity and internal friction of a polycrystalline sample of the ceramic superconductor EuBa2Cu3O7-x. The low temperature data can be quantitavely understood assuming the interaction of phonons with tunneling systems.