Magnetic and Magnetotransport Properties of the Magnetic Topological Nodal‐Line Semimetal TbSbTe

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 c1 ≈ 10.5 kOe, H c2 ≈ 20.8 kOe, and H c3 ≈ 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.