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Nonreciprocal transport in the superconducting state of the chiral crystal NbGe$_{\bf 2}$ |
| Yonglai Liu1,2, Xitong Xu1,†, Miao He1,2, Haitian Zhao1,2, Qingqi Zeng1, Xingyu Yang1,2, Youming Zou1, Haifeng Du1,2, and Zhe Qu1,2,‡ |
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 |
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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}$. Interestingly, the intensity can be adjusted and even sign-reversed by varying the current, the temperature, and the crystalline orientation. Our findings illustrate intricate vortex dynamics and offer ways of manipulation on the rectification effect in superconductors with structural chirality.
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Received: 31 January 2024
Revised: 08 March 2024
Accepted manuscript online:
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PACS:
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74.25.F-
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(Transport properties)
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74.25.Wx
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(Vortex pinning (includes mechanisms and flux creep))
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73.23.-b
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(Electronic transport in mesoscopic systems)
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| Fund: Project supported by the National Key R & D Program of China (Grant No. 2022YFA1403603), the National Natural Science Foundation of China (Grant Nos. U2032213, 12104461, 12374129, and 12304156), and Chinese Academy of Sciences (Grant Nos. YSBR-084, and JZHKYPT-2021-08). A portion of this work was supported by the High Magnetic Field Laboratory of Anhui Province. |
Corresponding Authors:
E-mail:xuxitong@hmfl.ac.cn;E-mail:zhequ@hmfl.ac.cn
E-mail: xuxitong@hmfl.ac.cn;zhequ@hmfl.ac.cn
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Cite this article:
Yonglai Liu, Xitong Xu, Miao He, Haitian Zhao, Qingqi Zeng, Xingyu Yang, Youming Zou, Haifeng Du, and Zhe Qu Nonreciprocal transport in the superconducting state of the chiral crystal NbGe$_{\bf 2}$ 2024 Chin. Phys. B 33 057402
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