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Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 30: Superconductivity - Poster Session

TT 30.42: Poster

Monday, March 31, 2014, 15:00–19:00, P2

Applied dynamic strain on FeSe0.5Te0.5 through piezo-electric substrates. — •Sebastian Molatta, Sascha Trommler, Jens Hänisch, Kazumasa Iida, Michael Schulze, Sabine Wurmehl, Bernd Büchner, Ludwig Schultz, and Ruben Hühne — IFW Dresden, PF 27 01 16, 01171 Dresden

FeSe1−xTex is the structural most simple iron-based superconductor and shows a high sensitivity to applied strain. Typically, different substrates are used for the variation of static strain states in thin films to investigate the influence of the lattice parameters on the superconducting properties. However, this approach is restricted to thin layers ensuring a coherent growth. An alternative is to use epitaxial films on piezo-electric substrates, which allows the dynamic change of the lattice parameters to examine the influence of strain on the superconducting properties.

Therefore, we grew FeSe0.5Te0.5 films by pulsed laser deposition on different substrates. The epitaxial growth was first optimized on MgO single crystals and transferred afterwards to piezoelectric 0.72 Pb(Mg1/3Nb2/3)O3-0.28 PbTiO3 (PMN-PT) substrates. In both cases an epitaxial growth and a superconducting transition Tc of more than 15 K were observed under optimized conditions. Finally, a shift in Tc of about 0.25 K for a change of 0.04% in the in-plane lattice-parameters was found in strain experiments for these FeSe0.5Te0.5-films grown on PMN-PT.

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