Propagation of surface acoustic waves in structures incorporating high-temperature superconductors

Analysis of the propagation of surface acoustic waves (SAW) was carried out in piezoelectric-high-temperature superconductor (HTSC) film-dielectric structure near the superconducting transition of the HTSC film. By considering a change in the resistive state of the film, its inhomogeneity in a direction perpendicular to the substrate, and the mechanical load of the piezoelectric, equations describing the temperature dependence of the velocity and attenuation of the SAW were obtained. Our calculations agree with experimental results for LiNbO₃-YBa₂Cu₃O₇ structures if possible inhomogeneities in the film are taken into account.Institute for Automated Control Systems and Radio Electronics, Tomsk. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 7, pp. 38–45, July, 1992.