Large Magnetoresistance and Nontrivial Berry Phase in Nb$_3$Sb Crystals with A15 Structure
Qin Chen1 , Yuxing Zhou1 , Binjie Xu1 , Zhefeng Lou1 , Huancheng Chen1 , Shuijin Chen1 , Chunxiang Wu1 , Jianhua Du2 , Hangdong Wang3 , Jinhu Yang3 , and Minghu Fang1,4*
1 Department of Physics, Zhejiang University, Hangzhou 310027, China2 Department of Applied Physics, China Jiliang University, Hangzhou 310018, China3 Department of Physics, Hangzhou Normal University, Hangzhou 310036, China4 Collaborative Innovation Center of Advanced Microstructure, Nanjing University, Nanjing 210093, China
Abstract ：Compounds with the A15 structure have attracted extensive attention due to their superconductivity and nontrivial topological band structures. We have successfully grown Nb$_3$Sb single crystals with the A15 structure and systematically measured the longitudinal resistivity, Hall resistivity and quantum oscillations in magnetization. Similar to other topological trivial/nontrivial semimetals, Nb$_3$Sb exhibits large magnetoresistance (MR) at low temperatures (717$\%$, 2 K and 9 T), unsaturating quadratic field dependence of MR and up-turn behavior in $\rho_{xx}(T)$ curves under magnetic field, which is considered to result from a perfect hole-electron compensation, as evidenced by the Hall resistivity measurements. The nonzero Berry phase obtained from the de-Hass van Alphen (dHvA) oscillations demonstrates that Nb$_3$Sb is topologically nontrivial. These results indicate that Nb$_{3}$Sb superconductor is also a semimetal with large MR and nontrivial Berry phase. This indicates that Nb$_{3}$Sb may be another platform to search for the Majorana zero-energy mode.
收稿日期: 2021-05-03
Editors' Suggestion
出版日期: 2021-08-02
:
72.15.Gd
(Galvanomagnetic and other magnetotransport effects)
引用本文:
. [J]. 中国物理快报, 2021, 38(8): 87501-.
链接本文:
https://cpl.iphy.ac.cn/CN/10.1088/0256-307X/38/8/087501
或
https://cpl.iphy.ac.cn/CN/Y2021/V38/I8/87501
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2021, Vol. 38 
