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TT: Fachverband Tiefe Temperaturen
TT 52: Frustrated Magnets: Strong Spin-Orbit Coupling
TT 52.8: Talk
Thursday, March 30, 2023, 17:00–17:15, HSZ 201
Phononic-magnetic dichotomy of the thermal Hall effect in the Kitaev-Heisenberg candidate material Na2Co2TeO6 — •Matthias Gillig1, Xiaochen Hong2,1, Christoph Wellm1, Vladislav Kataev1, Weiliang Yao3, Yuan Li3, Bernd Büchner1, and Christian Hess2,1 — 1Leibniz Institute for Solid State and Materials Research, 01069 Dresden, Germany — 2Fakultät für Mathematik und Naturwissenschaften, Bergische Universität Wuppertal, 42097 Wuppertal, Germany — 3International Center for Quantum Materials, School of Physics, Peking University, 100871 Beijing, China
We investigate the thermal Hall effect of the Kitaev quantum spin liquid candidate material Na2Co2TeO6 in both the magnetically ordered and the paramagnetic phase, with a magnetic field perpendicular to the honeycomb layers of this material. The transversal heat conductivity κxy is sizeable, but remains at all temperatures investigated significantly smaller than one half of the thermal conductance quantum which has been predicted as fingerprint of topologically protected Majorana edge modes in a Kitaev quantum spin liquid. κxy is negative in the paramagnetic phase but becomes positive deep in the antiferromagnetically ordered phase suggesting a non-phononic origin. However, distinct similarities are present in κxy and the longitudinal thermal conductivity κxx concerning both their temperature and field dependences. Thus our findings imply an at least two-component, i.e. magnetic and phononic origin of the thermal Hall effect in Na2Co2TeO6.