SKM 2021 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 18: Frustrated Magnets

TT 18.8: Vortrag

Donnerstag, 30. September 2021, 12:00–12:15, H7

Thermal Transport of a Co-based candidate Kitaev quantum spin liquid (kQSL) material Na₂Co₂TeO₆ — •Xiaochen Hong^1,2, Matthias Gillig¹, Richard Hentrich¹, Weiliang Yao³, Vilmos Kocsis¹, Arthur Witte^1,4, Tino Schreiner¹, Danny Baumann¹, Nicolás Pérez¹, Anja Wolter¹, Yuan Li³, Bernd Büchner^1,4, and Christian Hess^1,2 — ¹IFW-Dresden, Germany — ²Bergische Universität Wuppertal, Germany — ³Peking University, China — ⁴TU Dresden, Germany

Motivated by recent theoretical predications that kQSL states can be realized in certain 3d transition metal based materials, we studied the thermal transport properties of Na₂Co₂TeO₆ single crystals in a wide field-temperature parameter space, up to 16 T and down to 50 mK. We found that phonons, which are strongly scattered by magnetic excitations, are responsible for thermal transport in Na₂Co₂TeO₆. By analyzing the field-temperature dependence of the magneto-phonon scattering, we found major similarities between Na₂Co₂TeO₆ and the leading kQSL candidate α-RuCl₃, supporting theoretical proposals. Besides, we discovered highly anisotropic field effect, signatures of multiple field-induced transitions, and novel oscillation-like thermal transport features. Our findings encourage more studies on Na₂Co₂TeO₆, as a promising kQSL material and an exotic quantum magnet.