Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 30: Superconductivity - Poster Session

TT 30.42: Poster

Montag, 31. März 2014, 15:00–19:00, P2

Applied dynamic strain on FeSe_0.5Te_0.5 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

FeSe_1−xTe_x 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 FeSe_0.5Te_0.5 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(Mg_1/3Nb_2/3)O₃-0.28 PbTiO₃ (PMN-PT) substrates. In both cases an epitaxial growth and a superconducting transition T_c of more than 15 K were observed under optimized conditions. Finally, a shift in T_c 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.