Thermal Hall effect in a van der Waals triangular magnet FeCl2
Thermal Hall effect in a van der Waals triangular magnet FeCl2
复制标题
范德瓦尔斯三角磁体 FeCl2 中的热霍尔效应
DOI：
10.1103/physrevb.107.l060404
复制
发表时间：
2023
影响因子：
3.7
通讯作者：
Ke, Xianglin
中科院分区：
文献类型：
--
作者：
Xu, Chunqiang;Carnahan, Caitlin;Zhang, Heda;Sretenovic, Milos;Zhang, Pengpeng;Xiao, Di;Ke, Xianglin
热输运是研究低能、电中性准粒子在绝缘磁体中运动的关键。本文报道了在货车德瓦耳斯反铁磁体中观测到的大的磁热导率和热霍尔效应。磁热导率达到，表明强的磁振子-声子耦合。此外，我们还发现了一个可观的热霍尔信号，该信号的变化与从反铁磁态到极化铁磁态的自旋翻转跃迁同时发生。我们的理论计算表明，除了在杂化磁振子和声学声子模式的反交叉点处诱导的Berry曲率外，还需要其他机制来解释所观察到的THE的大小。
Thermal transport is a pivotal probe for studying low-energy, charge-neutral quasiparticles in insulating magnets. In this Letter, we report an observation of large magnetothermal conductivity and thermal Hall effect (THE) in a van der Waals antiferromagnet. The magnetothermal conductivity reaches over, indicating strong magnon-phonon coupling. Furthermore, we find an appreciable thermal Hall signal which changes sign concurrently with the spin-flip transition from the antiferromagnetic state to the polarized ferromagnetic state. Our theoretical calculations suggest that, in addition to the Berry curvature induced at the anticrossing points of the hybridized magnon and acoustic phonon modes of, other mechanisms are needed to account for the magnitude of the observed THE.