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

Shuvankar Gupta; Olajumoke Oluwatobiloba Emmanuel; Yasemin Ozbek; Mingyu Xu; Weiwei Xie; Pengpeng Zhang; Xianglin Ke

doi:10.1016/j.mtphys.2024.101627

paper

Giant Nernst Angle in Self-Intercalated van der Waals Magnet Cr $_{1.25}$ Te $_{2}$

arXiv:2412.11213 · doi:10.1016/j.mtphys.2024.101627

Abstract

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.

Accepted in Materials Today Physics

Giant Nernst Angle in Self-Intercalated van der Waals Magnet Cr1.25​Te2​

Abstract

References in corpus (7)

Giant Nernst Angle in Self-Intercalated van der Waals Magnet Cr $_{1.25}$ Te $_{2}$