Large Magnetoresistance and Nontrivial Berry Phase in Nb_(3)Sb Crystals with A15 Structure  

作　　者：Qin Chen Yuxing Zhou Binjie Xu Zhefeng Lou Huancheng Chen Shuijin Chen Chunxiang Wu Jianhua Du Hangdong Wang Jinhu Yang Minghu Fang 陈琴;周宇星;许彬杰;娄哲丰;陈奂丞;陈水金;吴春翔;杜建华;王杭栋;杨金虎;方明虎(Department of Physics,Zhejiang University,Hangzhou 310027,China;Department of Applied Physics,China Jiliang University,Hangzhou 310018,China;Department of Physics,Hangzhou Normal University,Hangzhou 310036,China;Collaborative Innovation Center of Advanced Microstructure,Nanjing University,Nanjing 210093,China)

机构地区：[1]Department of Physics,Zhejiang University,Hangzhou 310027,China [2]Department of Applied Physics,China Jiliang University,Hangzhou 310018,China [3]Department of Physics,Hangzhou Normal University,Hangzhou 310036,China [4]Collaborative Innovation Center of Advanced Microstructure,Nanjing University,Nanjing 210093,China

出　　处：《Chinese Physics Letters》2021年第8期110-114,共5页中国物理快报（英文版）

基　　金：the National Key R&D Program of China(Grant No.2016YFA0300402);the National Natural Science Foundation of China(Grant Nos.12074335,and 11974095);the Fundamental Research Funds for the Central Universities。

摘　　要：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 ρ_(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.

关 键 词：nontrivial BERRY TOPOLOGICAL 

分 类 号：O469[理学—凝聚态物理]