Anisotropic Magnetoresistivity in Semimetal TaSb$_2$
Xia-Yin Liu1, Jia-Lu Wang2, Wei You2, Ting-Ting Wang2, Hai-Yang Yang2, Wen-He Jiao1, Hong-Ying Mao2, Li Zhang3, Jie Cheng4, Yu-Ke Li2**
1Department of Physics, Zhejiang University of Science and Technology, Hangzhou 310023 2Department of Physics and Hangzhou Key Laboratory of Quantum Matters, Hangzhou Normal University, Hangzhou 310036 3Department of Physics, China Jiliang University, Hangzhou 310018 4College of Science, Center of Advanced Functional Ceramics, Nanjing University of Posts and Telecommunications, Nanjing 210023
Abstract：We investigate the anisotropic magnetic transports in topological semimetal TaSb$_2$. The compound shows the large magnetoresistance (MR) without saturation and the metal-insulator-like transition no matter whether the magnetic field is parallel to $c$-axis or $a$-axis, except that the MR for ${\boldsymbol B}\|c$ is almost twice as large as that of ${\boldsymbol B}\|a$ at low temperatures. The adopted Kohler's rule can be obeyed by the MR at distinct temperatures for ${\boldsymbol B}\|c$, but it is slightly violated as ${\boldsymbol B}\|a$. The angle-dependent MR measurements exhibit the two-fold rotational symmetry below 70 K, consistent with the monoclinic crystal structure of TaSb$_2$. The dumbbell-like picture of angle-dependent MR in TaSb$_2$ suggests a strongly anisotropic Fermi surface at low temperatures. However, it finally loses the two-fold symmetry over 70 K, implying a possible topological phase transition at around the temperature where $T_{\rm m}$ is related to a metal-insulator-like transition under magnetic fields.
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2017, Vol. 34 
