Berlin 2018 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 7: Topological Semimetals I
TT 7.13: Talk
Monday, March 12, 2018, 12:45–13:00, A 053
Optical Conductivity Studies of the half-Heusler Compounds GdPtBi, LuPtBi, YPtBi and YbPtBi — •Felix Hütt1, Micha B. Schilling1, Martin Dressel1, Claudia Felser2, and Artem V. Pronin1 — 11. Physikalisches Institut, Universität Stuttgart, 70569 Stuttgart, Germany — 2Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
Many Heusler and half-Heusler compounds are known for their diverse and appealing physical properties. Some of the compounds are predicted to possess non-trivial topological electronic structure. Although the non-trivial topology has already been discussed by theory for a few years, experiments so far remain pretty much behind theory.
In this contribution, we report on experimental investigations of the optical response of four different half-Heusler compounds (GdPtBi, LuPtBi, YPtBi, YbPtBi) using Fourier-transform infrared spectroscopy. Reflectivity measurements were performed over a large frequency range, 10 to 3000 meV, at different temperatures down to 10 K. From the measured reflectivity, the optical conductivity and the dielectric function were extracted via the Kramers-Kronig relations. In the talk, we compare our results with theoretical predictions for optical manifestations of possible Dirac physics in these materials.