Nonreciprocal transport in the superconducting state of the chiral crystal NbGe_(2)  

作　　者：刘永来 许锡童 何苗 赵海天 曾庆祺 杨星宇 邹优鸣 杜海峰 屈哲 Yonglai Liu;Xitong Xu;Miao He;Haitian Zhao;Qingqi Zeng;Xingyu Yang;Youming Zou;Haifeng Du;Zhe Qu(Anhui Key Laboratory of Low-Energy Quantum Materials and Devices,CAS Key Laboratory of Photovoltaic and Energy Conservation Materials,High Magnetic Field Laboratory of Chinese Academy of Sciences(CHMFL),HFIPS,CAS,Hefei 230031,China;Science Island Branch of Graduate School,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]Anhui Key Laboratory of Low-Energy Quantum Materials and Devices,CAS Key Laboratory of Photovoltaic and Energy Conservation Materials,High Magnetic Field Laboratory of Chinese Academy of Sciences(CHMFL),HFIPS,CAS [2]Science Island Branch of Graduate School,University of Science and Technology of China

出　　处：《Chinese Physics B》2024年第5期161-165,共5页中国物理B（英文版）

基　　金：Project supported by the National Key R&D Program of China(Grant No.2022YFA1403603);the National Natural Science Foundation of China(Grant Nos.U2032213,12104461,12374129,and 12304156);Chinese Academy of Sciences(Grant Nos.YSBR-084,and JZHKYPT-2021-08);A portion of this work was supported by the High Magnetic Field Laboratory of Anhui Province.

摘　　要：Due to the lack of inversion,mirror or other roto-inversion symmetries,chiral crystals possess a well-defined handedness which,when combined with time-reversal symmetry breaking from the application of magnetic fields,can give rise to directional dichroism of the electrical transport phenomena via the magnetochiral anisotropy.In this study,we investigate the nonreciprocal magneto-transport in microdevices of NbGe_(2),a superconductor with structural chirality.A giant nonreciprocal signal from vortex motions is observed during the superconducting transition,with the ratio of nonreciprocal resistance to the normal resistanceγreaching 6×10^(5)T^(-1)·A^(-1).Interestingly,the intensity can be adjusted and even sign-reversed by varying the current,the temperature,and the crystalline orientation.Our findings illustrate intricate vortex dynamics and offer ways of manipulation on the rectification effect in superconductors with structural chirality.

关 键 词：chiral crystals magnetochiral anisotropy superconducting vortex nonreciprocal transport 

分 类 号：O511.3[一般工业技术—材料科学与工程]