Band-Filling Effect on Anomalous Hall Conductivity and Thermoelectric Property in Weyl Semimetal Co₃Sn₂S₂

Yu Hao Chang^1*, Ren Hao Jhang², Shang-Fan Lee², Jing-Yue Huang³, Cheng-Maw Cheng^3,1, Huan-Li Meng⁴, Yung-Kang Kuo⁴, Yi Jia Tsai², Min-Nan Ou², Chia Nung Kuo^5,6, Chin Shan Lue^5,6, Hsin-Ju Chen¹, Hung-Cheng Wu¹, Hung-Duen Yang^1,7

¹Department of Physics, National Sun Yat-sen University, Kaohsiung, Taiwan
²Institute of Physics, Academia Sinica, Taipei, Taiwan
³National Synchrotron Radiation Research Center, Hsinchu City, Taiwan
⁴Department of Physics, National Dong Hwa University, Hualien, Taiwan
⁵Department of Physics, National Cheng Kung University, Tainan, Taiwan
⁶Taiwan Consortium of Emergent Crystalline Materials, National Science and Technology Council, Taipei, Taiwan
⁷Center of Crystal Research, National Sun Yat-sen University, Kaohsiung, Taiwan

* Presenter:Yu Hao Chang, email:cassis88855@gmail.com

The anomalous Hall effect arises from both intrinsic and extrinsic mechanisms. Recent studies have shown that doping enhances the anomalous Hall conductivity (AHC) in Co₃Sn₂S₂, prompting an investigation into its band structure. In this work, we demonstrate that both Ni-substitution and Fe-substitution enhance the AHC, which we attribute to shifts in the Fermi energy and band-broadening effects, as confirmed by our angle-resolved photoemission spectroscopy measurements. Additionally, we report the temperature-dependence of the Seebeck coefficient and thermal conductivity. The temperature-dependent Seebeck coefficient curve fitting provides additional support for dopant-induced modifications of the band structure and Fermi energy, and the temperature-dependent thermal conductivity exhibits decreased values in Fe-doped and Ni-doped samples. These findings enhance our understanding of band-filling effects on AHC, potentially advancing topological spintronics.

Keywords: The anomalous Hall effect, Transport phenomena, Weyl semimetal, Band-filling effect