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.
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)
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.