Berlin 2018 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 52: Superconductivity: Fe-based Superconductors - FeSe and LiFeAs
TT 52.3: Talk
Wednesday, March 14, 2018, 10:00–10:15, HFT-FT 101
Response of the Structural Transition of FeSe under Uniaxial Stress — •Jack Bartlett1,2, Alexander Steppke1, Suguru Hosoi3, Takasada Shibauchi3, Andrew Mackenzie1,2, and Clifford Hicks1 — 1Max-Planck Institute for Chemical Physics of Solids, Nöthnitzerstr. 40, Dresden, 01187, Germany — 2University of St Andrews, School of Physics and Astronomy, St Andrews KY16 9SS, United Kingdom — 3University of Tokyo, Department of Advanced Materials Science, Kashiwa, Chiba 277-8561, Japan
FeSe is unique as an iron-based superconductor due to its simple structure, and lack of magnetic order at ambient pressure, which offers an opportunity to disentangle the interplay of structural, magnetic and orbital degrees of freedom. Additionally, this material undergoes a structural phase transition at Ts ∼ 90 K, in which the lattice changes symmetry from tetragonal to orthorhombic. Uniaxial stress is a conjugate field to this transition, and therefore one naively expects an increase in the transition temperature and a broadening of the transition under uniaxial stress. We observe an unexpected suppression of Ts under both compressive and tensile stress, as well as a dramatic broadening of the transition. We discuss these results in the context of orbital-selective physics.