Significant thermal Hall effect in the <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mn>3</mn><mi>d</mi></mrow></math> cobalt Kitaev system <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><msub><mi>Na</mi><mn>2</mn></msub><msub><mi>Co</mi><mn>2</mn></msub><mi>Te</mi><msub><mi mathvariant="normal">O</mi><mn>6</mn></msub></mrow></math>

Heejun Yang; Chaebin Kim; Ysun Choi; Jun Han Lee; Gaoting Lin; Jie Ma; Marie Kratochvílová; Petr Proschek; Eun-Gook Moon; Ki Hoon Lee; Yoon Seok Oh; Je-Geun Park

doi:10.1103/PhysRevB.106.L081116

Letter

Significant thermal Hall effect in the $3 d$ cobalt Kitaev system ${Na}_{2} {Co}_{2} Te O_{6}$

Heejun Yang ^1,2, Chaebin Kim^1,2, Ysun Choi^1,2, Jun Han Lee ³, Gaoting Lin⁴, Jie Ma ⁴, Marie Kratochvílová ⁵, Petr Proschek ⁵, Eun-Gook Moon⁶ et al.

Ki Hoon Lee⁷, Yoon Seok Oh ^3,*, and Je-Geun Park ^1,2,†

¹Center for Quantum Materials, Seoul National University, Seoul 08826, Republic of Korea
²Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea
³Department of Physics, Ulsan National Institute of Science and Technology, Ulsan 44919, Republic of Korea
⁴Key Laboratory of Artificial Structures and Quantum Control, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
⁵Charles University, Faculty of Mathematics and Physics, Department of Condensed Matter Physics, Ke Karlovu 5, 121 16 Prague 2, Czech Republic
⁶Department of Physics, Korea Advanced Institutes of Science and Technology, Daejeon 34141, Republic of Korea
⁷Department of Physics, Incheon National University, Incheon 22012, Republic of Korea

^*ysoh@unist.ac.kr
^†jgpark10@snu.ac.kr

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Phys. Rev. B 106, L081116 – Published 18 August, 2022

DOI: https://doi.org/10.1103/PhysRevB.106.L081116

Abstract

Kitaev physics has recently attracted attention in condensed matter for its anticipated quantum spin liquid (QSL) state. The thermal transport measurement is crucial for probing the features of charge-neutral quasiparticles. In this letter, we report a significant thermal Hall effect in ${Na}_{2} {Co}_{2} Te O_{6}$ (NCTO), a Kitaev QSL candidate, when the magnetic field is applied along the out-of-plane direction of the honeycomb plane. The thermal conductivity ( $κ_{x x}$ ) and thermal Hall conductivity ( $κ_{x y}$ ) in NCTO reveal distinct magnetic field dependences below and above the Neel temperature $(T_{N})$ of 27 K. For $T > T_{N}, κ_{x x}$ has a monotonic decrease in the field dependence, while $κ_{x y}$ persists up to $T^{*} = 150 K$ . On the other hand, both $κ_{x x}$ and $κ_{x y}$ exhibit complex field dependence for $T < T_{N}$ .

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Significant thermal Hall effect in the $3 d$ cobalt Kitaev system ${Na}_{2} {Co}_{2} Te O_{6}$

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Significant thermal Hall effect in the 3d cobalt Kitaev system Na2Co2TeO6

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Significant thermal Hall effect in the $3 d$ cobalt Kitaev system ${Na}_{2} {Co}_{2} Te O_{6}$