The lattice mismatch between the substrate and the film is known to influence strongly the properties of thin films. In superconducting films this may result in the decrease, or, in some cases, in the enhancement of the superconducting transition temperature. It usually affects also the behavior of critical currents which allows accessing the nature of vortex pinning in the films.
In this contribution we study the effect of the in-plane epitaxial mismatch between the substrate and the film on the crystallographic structure and the transport properties of YBa₂Cu₃O_7-δ superconducting films of thicknesses ranging between 600A and 3000A. The films are grown by pulsed laser deposition on the new type of single-crystalline substrates prepared by Czochralski method, with the chemical formula (SrAl_0.5Ta_0.5O₃)_0.7(CaAl_0.5Ta_0.5O₃)_0.1(LaAlO₃)_0.2, with the in-plane lattice parameter a = 3.8741A. We find that superconducting properties of the samples are excellent, and generally they improve with increasing of the film thickness as a result of improved structural ordering. We also investigate the influence of the film thickness on the behavior of the critical current densities, and compare the results with the behavior studied previously for other types of substrates [1].

[1] C. J. van der Beek, M. Konczykowski, A. Abaloshev, I. Abalosheva, P. Gierłowski, S. J. Lewandowski, M. V. Indenbom, S. Barbanera, "Strong pinning in high temperature superconducting films", Phys. Rev B. 66, 024523 (2002).

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