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TT: Fachverband Tiefe Temperaturen

TT 15: SC: Fabrication and Characterization

TT 15.2: Vortrag

Montag, 14. März 2011, 16:45–17:00, HSZ 301

Preparation and characterization of YBa₂Cu₃O_7−δ thin films on piezoelectric substrates — •Patrick Pahlke, Sascha Trommler, Ruben Hühne, Bernhard Holzapfel und Ludwig Schultz — IFW Dresden, Institute for Metallic Materials, PO Box 270116, D-01171 Dresden, Germany

The electronic properties of superconducting materials are correlated to external strain. A suitable approach to study this interplay is the preparation of thin superconducting films on piezoelectric substrates. The lattice parameter of theses substrates can be tuned continuously by applying an electric field. Superconducting YBa₂Cu₃O_7−δ (YBCO) thin films were successfully prepared on single crystalline piezoelectric (001) Pb(Mg_1/3Nb_2/3)_0.72Ti_0.28O₃ substrates using off-axis pulsed laser deposition. Transport measurements revealed a superconducting transition temperature of T_c,50 = 89 K with a transition width of 1 K. By inducing a biaxial strain of 0.2 % in the a-b plane of YBCO a shift of the superconducting transition temperature of Δ T_c,50 = 0.1 K was observed for optimally doped YBCO. A significant larger effect was found for underdoped samples. We will present the results of these straining experiments and the detailed structural analysis of the grown films. Furthermore our investigations on low temperature properties of the used PMN-PT substrates, which are required for the evaluation of the applicable strain in this temperature region, will be discussed.