Dresden 2011 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 57: SC: Fe-based Superconductors - 122 - Thin Films

TT 57.2: Vortrag

Donnerstag, 17. März 2011, 17:30–17:45, HSZ 304

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

The interplay between structural parameters and superconducting properties attracts high interest in particular regarding the iron based superconductors. In contrast to the cuprate family, superconductivity of the latter can be induced using either pressure or chemical substitution. Nevertheless little is known about this relationship when biaxial strain is applied. The generation of biaxial strain by the preparation of thin films on substrates with different lattice mismatch is well established for cuprates. However, high quality films are necessary to correlate structural changes with electronic properties. In this work an alternative approach is used. Single crystalline piezoelectric substrates offer the unique opportunity to tune the lattice parameters continuously using the inverse piezoelectric effect. We prepared thin epitaxial La_1−xSr_xCuO₄ and BaFe_2−xCo_xAs₂ films on piezoelectric (001) Pb(Mg_1/3Nb_2/3)_0.72Ti_0.28O₃ (PMN-PT) substrates. A reversible shift of the superconducting transition has been achieved with a value of 0.44 K for La_1.85Sr_0.15CuO₄ and 0.2 K for BaFe_1.8Co_0.2As₂ for a biaxial strain of 0.022% and 0.017%, respectively.