Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 35: Frustrated Magnets - Strong Spin-Orbit Coupling 1 (joint session TT/MA)

TT 35.7: Vortrag

Mittwoch, 18. März 2020, 11:30–11:45, HSZ 304

Thermal Transport of the Kitaev spin-liquid candidate α-RuCl₃ — Richard Hentrich¹, •Matthias Gillig¹, Xiaochen Hong¹, Federico Caglieris¹, Maria Roslova², Anna Isaeva^{1, 2}, Thomas Doert², Uli Zeitler³, Matija Culo³, Maryam Shahrokhvand³, Bernd Büchner^{1, 4}, and Christian Hess^{1, 4} — ¹Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden, Germany — ²Faculty of Chemistry and Food Chemistry, TU Dresden, Germany — ³High Field Magnet Laboratory (HFML-EFML), Radboud University Nijmegen, 6525 ED Nijmegen, The Netherlands — ⁴Center for Transport and Devices, TU Dresden, Germany

α-RuCl₃ currently is the best known candidate material for realizing Kitaev physics. Previous experiments on the longitudinal thermal conductivity revealed a strong coupling of he magnetic and phononic subsystems which results in a strongly magnetic field dependent thermal conductivity due to the field-induced opening of a gap [1]. Furthermore, a sizeable thermal Hall effect has been observed which triggered the search for signatures of fractionalized thermal transport due to topological edge modes near an in-plane field value of 8 T where long-range magnetic order is suppressed but the spin gap is still small [2]. Here we focus on low-temperature and high-field (up to 30 T) studies of the thermal transport which suggest the persistence of low-energy field-dependent modes up to the highest field studied at 30 T.
[1] R. Hentrich et al., Phys. Rev. Lett. 120, 117240 (2018)
[2] Y. Kasahara et al., Nature 559, 227 (2018)