• Letter

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

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, and Je-Geun Park
Phys. Rev. B 106, L081116 – Published 18 August 2022
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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 Na2Co2TeO6 (NCTO), a Kitaev QSL candidate, when the magnetic field is applied along the out-of-plane direction of the honeycomb plane. The thermal conductivity (κxx) and thermal Hall conductivity (κxy) in NCTO reveal distinct magnetic field dependences below and above the Neel temperature (TN) of 27 K. For T>TN, κxx has a monotonic decrease in the field dependence, while κxy persists up to T*=150K. On the other hand, both κxx and κxy exhibit complex field dependence for T<TN.

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  • Received 24 November 2021
  • Revised 26 June 2022
  • Accepted 2 August 2022

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

©2022 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Heejun Yang1,2, Chaebin Kim1,2, Ysun Choi1,2, Jun Han Lee3, Gaoting Lin4, Jie Ma4, Marie Kratochvílová5, Petr Proschek5, Eun-Gook Moon6, Ki Hoon Lee7, Yoon Seok Oh3,*, and Je-Geun Park1,2,†

  • 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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Issue

Vol. 106, Iss. 8 — 15 August 2022

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