Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 16: Poster Session Superconductivity, Cryogenic Particle Detectors, Cryotechnique

TT 16.15: Poster

Montag, 16. März 2020, 15:00–19:00, P2/EG

Towards the study of uniaxial strain in epitaxial FeSexTe1−x films — •Aleena Anna Thomas1,2, Thomas Doert2, Kornelius Nielsch1,2, and Ruben Hühne11Leibniz Institute for Metallic Materials, IFW Dresden, 01069 Dresden, Germany — 2TU Dresden, 01062 Dresden, Germany

The discovery of high temperature superconductivity in layered iron-based material has ignited significant scientific interest in basic studies of their properties as well as for technological applications. Among them, iron selenide has the simplest crystal structure, in which superconductivity can be tuned either by strain or by doping. In particular, it has been reported in literature that the transition temperature can be increased by compressive substrate-induced biaxial strain in thin film. Our aim is to extend these investigations in order to study the correlation between uniaxial strain and critical temperature in thin films. In order to study such thin film in a uniaxial strain cell, we grew iron selenides on ultra-thin single crystalline substrates. Therefore, a thin Fe(Se,Te) seed layer was deposited on these substrates at 400 C using pulsed laser deposition, followed by a homo-epitaxially grown Fe(Se,Te) film at 300 C. All films are highly textured and show a maximum superconducting transition temperature of 21 K, 19 K and 17 K on CaF2, SrTiO3 and MgO, respectively. These thin films will be studied to infer the influence of uniaxial strain on the superconducting transition in FeSe materials using the aid of uniaxial strain cell.

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