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Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 53: Frustrated Magnets - Strong Spin-Orbit Coupling (joint session TT/MA)

TT 53.13: Vortrag

Donnerstag, 4. April 2019, 12:45–13:00, Theater

Heat transport in the putative Kitaev-Heisenberg spin liquid α-RuCl3 under high magnetic fields — •Matthias Gillig1, Xiaochen Hong1, Richard Hentrich1, Federico Caglieris1, Maryam Shahrokhvand2, Uli Zeitler2, Maria Roslova3, Anna Isaeva3, Thomas Doert3, Bernd Büchner1, and Christian Hess11Leibniz Institute for Solid State and Material Research Dresden, Germany — 2HFML, Radboud University, Nijmegen, Netherlands — 3Faculty of Chemistry and Food Chemistry, TU Dresden, Germany

α-RuCl3 is due to the honeycomb structure of its Ru-sites and the exchange frustration a prime candidate to realize the Kitaev model in a material. The model bears interesting physics with a quantum spin liquid (QSL) ground state and exotic excitations. Although α-RuCl3 orders antiferromagnetically (AFM) below 7 K, indications of a QSL were found experimentally.

We have performed heat transport measurements on α-RuCl3 down to T = 0.4 K and up to B = 33 T. Below T = 4 K thermal conductivity κ is raised in low magnetic fields up to 5 T before it decreases again to a minimum at 8 T. This decline coincides with the suppression of the AFM phase. For B > 8 T, κ is strongly enhanced for all temperatures and no sign of saturation is observed. The increase of thermal conductivity can be assigned to a field-induced phase featuring a field-dependent excitation spectrum. More specifically the data suggest the opening of a spin excitation gap which reduces the phononic scattering rate. For the whole T- and B-range investigated the data are consistent with a pure phononic heat transport mechanism.

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