Planar thermal Hall effect from phonons in a Kitaev candidate material
Lu Chen (lu.chen@usherbrooke.ca),
Étienne Lefrançois,
Ashvini Vallipuram,
Quentin Barthélemy,
Amirreza Ataei,
Weiliang Yao,
Yuan Li and
Louis Taillefer (louis.taillefer@usherbrooke.ca)
Additional contact information
Lu Chen: Université de Sherbrooke
Étienne Lefrançois: Université de Sherbrooke
Ashvini Vallipuram: Université de Sherbrooke
Quentin Barthélemy: Université de Sherbrooke
Amirreza Ataei: Université de Sherbrooke
Weiliang Yao: School of Physics, Peking University
Yuan Li: School of Physics, Peking University
Louis Taillefer: Université de Sherbrooke
Nature Communications, 2024, vol. 15, issue 1, 1-7
Abstract:
Abstract The thermal Hall effect has emerged as a potential probe of exotic excitations in spin liquids. In the Kitaev magnet $${{\alpha }}$$ α -RuCl3, the thermal Hall conductivity $${{{\kappa }}}_{{{xy}}}$$ κ x y has been attributed to Majorana fermions, chiral magnons, or phonons. Theoretically, the former two types of heat carriers can generate a “planar” $${{{\kappa }}}_{{{xy}}}$$ κ x y , whereby the magnetic field is parallel to the heat current, but it is unknown whether phonons also could. Here we show that a planar $${{{\kappa }}}_{{{xy}}}$$ κ x y is present in another Kitaev candidate material, Na2Co2TeO6. Based on the striking similarity between $${{{\kappa }}}_{{{xy}}}$$ κ x y and the phonon-dominated thermal conductivity $${{{\kappa }}}_{{{xx}}}$$ κ x x , we attribute the effect to phonons. We observe a large difference in $${{{\kappa }}}_{{{xy}}}$$ κ x y between different configurations of heat current and magnetic field, which reveals that the direction of heat current matters in determining the planar $${{{\kappa }}}_{{{xy}}}$$ κ x y . Our observation calls for a re-evaluation of the planar $${{{\kappa }}}_{{{xy}}}$$ κ x y observed in $$\,{{\alpha }}$$ α -RuCl3.
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-47858-5
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DOI: 10.1038/s41467-024-47858-5
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