Anomalous Hall effect of the quasi-two-dimensional weak itinerant ferromagnet Cr_4.14Te₈

¹ Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences Hefei, 230031, China
² University of Science and Technology of China - Hefei, 230026, China
³ Institute of Physical Science and Information Technology, Anhui University - Hefei, 230601, China
⁴ High Magnetic Field Laboratory, Chinese Academy of Sciences - Hefei, 230031, China
⁵ Collaborative Innovation Center of Advanced Microstructures, Nanjing University - Nanjing, 210093, China

^(a) xluo@issp.ac.cn
^(b) ypsun@issp.ac.cn

Received: 24 August 2018
Accepted: 11 December 2018

Abstract

The anomalous Hall effect (AHE), a manifestation of the Hall effect driven by the Berry curvature, has numerous applications in spintronics and valleytronics. However, its realization in quasi-two-dimensional (quasi-2D) chromium tellurides remains puzzling. In this paper, we synthesize the Cr_4.14Te₈ single crystal and find that it shows weak itinerant ferromagnetic (FM) metallic behavior with a large magnetocrystalline anisotropy. At the same time, Cr_4.14Te₈ exhibits the AHE below the FM phase-transition temperature . By taking into account the scaling behavior between the anomalous Hall resistivity and the longitudinal resistivity , the origin of the AHE in this system is suggested to stem from the skew-scattering mechanism. Moreover, the possible magnetic ground state in Cr_4.14Te₈ has also been discussed to reveal the origin of AHE. Our results may be helpful for exploring the potential applications of these kinds of quasi-2D FM metals.