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 Cr1.25Te2, 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 Cr1.25Te2 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 Cr1.25Te2 as a promising candidate for advanced thermoelectric devices based on the Nernst effect.
@article{arxiv.2412.11213,
title = {Giant Nernst Angle in Self-Intercalated van der Waals Magnet Cr$_{1.25}$Te$_2$},
author = {Shuvankar Gupta and Olajumoke Oluwatobiloba Emmanuel and Yasemin Ozbek and Mingyu Xu and Weiwei Xie and Pengpeng Zhang and Xianglin Ke},
journal= {arXiv preprint arXiv:2412.11213},
year = {2024}
}