标题： 自插层范德华磁体Cr$_{1.25}$Te$_2$中的巨Nernst角 显示英文标题

标题： Giant Nernst Angle in Self-Intercalated van der Waals Magnet Cr$_{1.25}$Te$_2$

摘要： 二维范德华（vdW）磁性材料的发现推动了技术设备的进步。 尼尔效应在存在纵向热梯度的情况下会产生横向电电压，这在热电应用中显示出巨大的潜力。 在本工作中，我们报告了Cr$_{1.25}$Te$_2$的电子和热电输运特性，这是一种层状自插入的vdW材料，在TN ~ 191 K时表现出反铁磁序，随后在TC ~ 171 K时发生类似铁磁的相变。我们在TC和TN之间观察到显著的拓扑霍尔效应和拓扑尼尔效应，这可归因于竞争的铁磁和反铁磁相互作用引起的非共面自旋结构导致实空间贝里相位。 此外，我们表明Cr$_{1.25}$Te$_2$展现出显著的异常尼尔效应，在TC附近具有约37%的巨大尼尔角和最大尼尔热电系数0.52 uV/K。 这些结果超过了传统铁磁体和其他二维vdW材料，突显了Cr$_{1.25}$Te$_2$作为基于尼尔效应的先进热电装置的有前途的候选材料。 显示英文摘要

摘要： The discovery of two-dimensional van der Waals (vdW) magnetic materials has propelled advancements in technological devices. The Nernst effect, which generates a transverse electric voltage in the presence of a longitudinal thermal gradient, shows great promise for thermoelectric applications. In this work, we report the electronic and thermoelectric transport properties of Cr$_{1.25}$Te$_2$, a layered self-intercalated vdW material which exhibits an antiferromagnetic ordering at TN ~ 191 K followed by a ferromagnetic-like phase transition at TC ~171 K. We observe a prominent topological Hall effect and topological Nernst effect between TC and TN, which is ascribable to non-coplanar spin textures inducing a real-space Berry phase due to competing ferromagnetic and antiferromagnetic interactions. Furthermore, we show that Cr$_{1.25}$Te$_2$ exhibits a substantial anomalous Nernst effect, featuring a giant Nernst angle of ~37% near TC and a maximum Nernst thermoelectric coefficient of 0.52 uV/K. These results surpass those of conventional ferromagnets and other two-dimensional vdW materials, highlighting Cr$_{1.25}$Te$_2$ as a promising candidate for advanced thermoelectric devices based on the Nernst effect.