Planar Thermal Hall Effects in Kitaev Spin Liquid Candidate Na2Co2TeO6
In: Phys. Rev. Research 4, L042035 (2022); (2022)
Online
report
We investigate both the longitudinal thermal conductivity ($\kappa_{xx}$) and the planar thermal Hall conductivity ($\kappa_{xy}$) in the Kitaev spin liquid candidate of Co-based honeycomb antiferromagnet Na$_2$Co$_2$TeO$_6$ in a magnetic field ($B$) applied along the $a$ and $a^*$ axes. A finite $\kappa_{xy}$ is resolved for both field directions in the antiferromagnetic (AFM) phase below the N\'eel temperature of 27 K. The temperature dependence of $\kappa_{xy}/T$ shows the emergence of topological bosonic excitations. In addition, the field dependence of $\kappa_{xy}$ shows sign reversals at the critical fields in the AFM phase, suggesting the changes in the Chern number distribution of the topological magnons. Remarkably, a finite $\kappa_{xy}$ is observed in $B \parallel a^*$ between the first-order transition field in the AFM phase and the saturation field, which is prohibited in a disordered state by the two-fold rotation symmetry around the $a^*$ axis of the honeycomb lattice, showing the presence of a magnetically ordered state that breaks the two-fold rotation symmetry. Our results demonstrate the presence of topological magnons in this compound in the whole field range below the saturation field.
Comment: 7 pages, 5 figures, and Supplementary Materials. To appear in Phys. Rev. Research
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Planar Thermal Hall Effects in Kitaev Spin Liquid Candidate Na2Co2TeO6
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Autor/in / Beteiligte Person: | Takeda, Hikaru ; Mai, Jiancong ; Akazawa, Masatoshi ; Tamura, Kyo ; Yan, Jian ; Moovendaran, Kalimuthu ; Raju, Kalaivanan ; Sankar, Raman ; Choi, Kwang-Yong ; Yamashita, Minoru |
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Quelle: | Phys. Rev. Research 4, L042035 (2022); (2022) |
Veröffentlichung: | 2022 |
Medientyp: | report |
DOI: | 10.1103/PhysRevResearch.4.L042035 |
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