中国物理B ›› 2024, Vol. 33 ›› Issue (5): 57402-057402.doi: 10.1088/1674-1056/ad334b

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Nonreciprocal transport in the superconducting state of the chiral crystal NbGe2

Yonglai Liu(刘永来)1,2, Xitong Xu(许锡童)1,†, Miao He(何苗)1,2, Haitian Zhao(赵海天)1,2, Qingqi Zeng(曾庆祺)1, Xingyu Yang(杨星宇)1,2, Youming Zou(邹优鸣)1, Haifeng Du(杜海峰)1,2, and Zhe Qu(屈哲)1,2,‡   

  1. 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, Hefei 230031, China;
    2 Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, China
  • 收稿日期:2024-01-31 修回日期:2024-03-08 接受日期:2024-03-13 出版日期:2024-05-20 发布日期:2024-05-20
  • 通讯作者: Xitong Xu, Zhe Qu E-mail:xuxitong@hmfl.ac.cn;zhequ@hmfl.ac.cn
  • 基金资助:
    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), and Chinese Academy of Sciences (Grant Nos. YSBR-084, and JZHKYPT-2021-08).

Nonreciprocal transport in the superconducting state of the chiral crystal NbGe2

Yonglai Liu(刘永来)1,2, Xitong Xu(许锡童)1,†, Miao He(何苗)1,2, Haitian Zhao(赵海天)1,2, Qingqi Zeng(曾庆祺)1, Xingyu Yang(杨星宇)1,2, Youming Zou(邹优鸣)1, Haifeng Du(杜海峰)1,2, and Zhe Qu(屈哲)1,2,‡   

  1. 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, Hefei 230031, China;
    2 Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, China
  • Received:2024-01-31 Revised:2024-03-08 Accepted:2024-03-13 Online:2024-05-20 Published:2024-05-20
  • Contact: Xitong Xu, Zhe Qu E-mail:xuxitong@hmfl.ac.cn;zhequ@hmfl.ac.cn
  • Supported by:
    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), and Chinese Academy of Sciences (Grant Nos. YSBR-084, and JZHKYPT-2021-08).

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 resistance ${\gamma}$ reaching 6$\times10^{5}$~T$^{-1}$$\cdot$A$^{-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

Abstract: 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 resistance ${\gamma}$ reaching 6$\times10^{5}$~T$^{-1}$$\cdot$A$^{-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.

Key words: chiral crystals, magnetochiral anisotropy, superconducting vortex, nonreciprocal transport

中图分类号:  (Transport properties)

  • 74.25.F-
74.25.Wx (Vortex pinning (includes mechanisms and flux creep)) 73.23.-b (Electronic transport in mesoscopic systems)