Regensburg 2010 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 20: SC: Fabrication and Characterization of Iron-Based and Other Superconductors

TT 20.10: Talk

Wednesday, March 24, 2010, 12:00–12:15, H19

Dynamic studies on the influence of strain on superconducting properties using piezoelectric substrates — •Sascha Trommler, Ruben Hühne, Patrick Pahlke, Ludwig Schultz, and Bernhard Holzapfel — IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany

It is known that the application of strain has a significant influence on the functional properties of superconducting materials. Typically, thin films are prepared on substrates with a different lattice misfit inducing a biaxial tensile or compressive strain to study this effect. Unfortunately, this approach is often restricted to very thin films. Furthermore, it is difficult to correlate strain and superconductivity directly, as the preparation conditions and the resulting microstructure may severely affect the superconducting properties. An alternative approach is the preparation of superconducting films on single crystalline piezoelectric substrates enabling a dynamical variation of the induced strain by applying an electric field on the substrate. This approach is used to study the strain dependence of superconducting properties in different materials. Therefore, thin epitaxial YBCO, La_1−xSr_xCuO₄ and BaFe_2−xCo_xAs₂ films were prepared on piezoelectric (001) Pb(Mg_1/3Nb_2/3)_0.72Ti_0.28O₃ substrates. Depending on the lattice parameter of these materials, additional buffer layers are required to achieve an epitaxial growth of the superconductor on these substrates. Finally, results on the influence of strain on superconducting properties like the transition temperature will be presented for these materials using dynamic investigations.