标题： 层状铁磁体Cr$_2$Te$_3$中的显著电子-磁振子散射 显示英文标题

标题： Significant electron-magnon scattering in layered ferromagnet Cr$_2$Te$_3$

摘要： 一种分层铁磁体Cr$_2$Te$_3$正因其独特的电子和磁性特性而引起越来越多的关注。研究表明，它表现出显著的反常霍尔效应（AHE），其符号随温度变化。然而，AHE的起源以及符号变化的原因仍然不清楚。在这里，我们通过磁子诱导的斜向散射实验证明，电子-磁子散射在Cr$_2$Te$_3$中对AHE有显著贡献，并且符号变化是由于与贝里曲率或杂质引起的侧跳贡献的竞争所致。电子-磁子斜向散射预计来源于巡游的Te$p$-电子与局域的Cr$d$-电子之间的交换相互作用，这种相互作用受到Te上的强自旋轨道耦合的影响。这些结果表明，磁子诱导的斜向散射可能在含有重元素的层状铁磁体中主导AHE。 显示英文摘要

摘要： A layered ferromagnet Cr$_2$Te$_3$ is attracting growing interest because of its unique electronic and magnetic properties. Studies have shown that it exhibits sizable anomalous Hall effect (AHE) that changes sign with temperature. The origin of the AHE and the sign change, however, remains elusive. Here we show experimentally that electron-magnon scattering significantly contributes to the AHE in Cr$_2$Te$_3$ through magnon induced skew scattering, and that the sign change is caused by the competition with the Berry-curvature or impurity-induced side-jump contribution. The electron-magnon skew scattering is expected to arise from the exchange interaction between the itinerant Te $p$-electrons and the localized Cr $d$-electrons modified by the strong spin-orbit coupling on Te. These results suggest that the magnon-induced skew scattering can dominate the AHE in layered ferromagnets with heavy elements.