Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 64: Frustrated Magnets - α-RuCl3 and Cu-based Materials
TT 64.6: Vortrag
Mittwoch, 14. März 2018, 16:15–16:30, HFT-FT 101
Thermal Hall effect in α-RuCl3 — •Richard Hentrich1,2, Bernd Büchner1,2, Maria Roslova3, Anna Isaeva3, Thomas Doert3, and Christian Hess1,2 — 1IFW Dresden, Germany — 2Center for Transport and Devices of Emergent Materials, TU Dresden, Germany — 3Department of Chemistry and Food Chemistry, TU Dresden, Germany
The Kitaev-Heisenberg model is source of a topological quantum spin liquid with Majorana fermions and gauge flux excitations as fractional quasiparticles. The material α-RuCl3 is composed of weakly van der Waals bound honeycomb layers of edge sharing RuCl6 octahedra which has recently emerged as a prime candidate for realising such physics. We studied α-RuCl3 by means of thermal transport measurements, a valuable tool to probe elementary excitations of systems with low dimensional spin structure.
While the in-plane, longitudinal heat transport is governed by heat conduction of phonons that strongly scatter off the magnetic excitations present in the system, studying the thermal Hall effect (Rhighi-Leduc effect) opens up a new path towards detecting a direct contribution of unconventional magnetic excitations to entropy transport.
We have observed a sizeable transversal heat conductivity κxy, the agreement of which with the theoretical predictions for the pure Kitaev model being suggestive of heat transport by fractionalised quasiparticles in α-RuCl3.