Magnetic and Magnetotransport Properties of the Magnetic Topological Nodal‐Line Semimetal TbSbTe
Fei Gao, Jianqi Huang, Weijun Ren, Hengheng Wu, Meng An, Xueliang Wu, Long Zhang, Tianran Yang, Aifeng Wang, Yisheng Chai, Xinguo Zhao, Teng Yang, Bing Li, Zhidong Zhang
Abstract
Abstract The magnetic properties, magneto‐resistivity, Hall resistivity, Seebeck coefficient, and heat capacity are investigated for a magnetic topological nodal‐line semimetal TbSbTe. The calculated energy‐band structures of TbSbTe show two nodal rings on the k x ‐ k y planes, and the Fermi surface possesses one electron pocket with an enclosure of one hole pocket around the Γ point. The multiple magnetic phase transitions are induced at critical magnetic fields of H c 1 ≈ 10.5 kOe, H c 2 ≈ 20.8 kOe, and H c 3 ≈ 38.2 kOe at 2 K for the H // ab plane. Temperature dependence of electrical resistivity displays a hump‐like feature around 240 K, a general positive slope above T N = 6 K but a negative slope below T N . The magnetoresistance exhibits a conversion from the semi‐classical H 2 dependence at weak fields to the linear‐field dependence at high fields, indicating the presence of a Dirac linear energy dispersion. TbSbTe may provide an ideal platform for studying topological physics and designing devices based on topological quantum materials.