Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 42: Correlated Electrons: Frustrated Magnets - Strong Spin-Orbit Coupling 2
TT 42.8: Vortrag
Mittwoch, 22. März 2017, 11:30–11:45, HSZ 304
Transport studies of the Kitaev-Heisenberg compound α-RuCl3 — •Richard Hentrich1,2, Bernd Büchner1,2, Domenic Nowak3, Anna Isaeva3, Thomas Doert3, Jennifer Sears4, Young-June Kim4, Paula J. Kelley5, Stephen E. Nagler5, and Christian Heß1,2 — 1IFW Dresden, Germany — 2Center for Transport and Devices of Emergent Materials, TU Dresden, Germany — 3Inorganic Chemistry Department II, TU Dresden, Germany — 4Department of Physics, University of Toronto, Canada — 5Oak Ridge National Laboratory, USA
α-RuCl3 is a material composed of weakly van der Waals bound honeycomb layers of edge sharing RuCl6 octahedra with the central atom being in a Jeff = 1/2 state. This kind of strongly frustrated spin structure is a candidate for Kitaev-Heisenberg physics which features non-trivial, fractionalised excitations.
Thermal transport measurements are known as a valuable tool to probe elementary excitations of systems with low dimensional spin structure and are possibly suited to detect Majorana fermionic contributions to the net heat conductivity.
We observe strong suppression of the phononic in-plane thermal conductivity of α-RuCl3 single crystals at low temperatures in zero magnetic field. However, upon applying an external magnetic field the heat conductivity is strongly enhanced. We interpret our findings in terms of a field-induced quantum phase transition.