Observation of superconducting diode effect in antiferromagnetic Mott insulator $α$-RuCl$_3$
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arXiv
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| Natura: | Preprint |
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2024
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| author | He, Jiadian Ding, Yifan Zeng, Xiaohui Zhang, Yiwen Wang, Yanjiang Dong, Peng Zhou, Xiang Wu, Yueshen Cao, Kecheng Ran, Kejing Wang, Jinghui Chen, Yulin Watanabe, Kenji Taniguchi, Takashi Yu, Shun-Li Li, Jian-Xin Wen, Jinsheng Li, Jun |
| author_facet | He, Jiadian Ding, Yifan Zeng, Xiaohui Zhang, Yiwen Wang, Yanjiang Dong, Peng Zhou, Xiang Wu, Yueshen Cao, Kecheng Ran, Kejing Wang, Jinghui Chen, Yulin Watanabe, Kenji Taniguchi, Takashi Yu, Shun-Li Li, Jian-Xin Wen, Jinsheng Li, Jun |
| contents | Nonreciprocal superconductivity, also called as superconducting diode effect that spontaneously breaks time-reversal symmetry, is characterized by asymmetric critical currents under opposite applied current directions. This distinct state unveils a rich ore of intriguing physical properties, particularly in the realm of nanoscience application of superconductors. Towards the experimental realization of superconducting diode effect, the construction of two-dimensional heterostructures of magnets and $s$-wave superconductors is considered to be a promising pathway. In this study, we present our findings of superconducting diode effect manifested in the magnetic Mott insulator $α$-RuCl$_3$. This phenomenon is induced by the proximity effect within a van der Waals heterostructure, consisting of thin $α$-RuCl$_3$/NbSe$_2$ flakes. Through transport property measurements, we have confirmed a weak superconducting gap of 0.2 meV, which is significantly lower than the intrinsic gap of NbSe$_2$(1.2 meV). Upon the application of a weak magnetic field below 70 mT, we observed an asymmetry in the critical currents under positive and negative applied currents. This observation demonstrates a typical superconducting diode effect in the superconducting $α$-RuCl$_3$. The superconducting diode effect and nonreciprocal resistance are observed exclusively when the magnetic field is aligned out-of-plane. This suggests that an Ising-type spin-orbit coupling in the superconducting $α$-RuCl$_3$ may be responsible for the mechanism. Our findings furnish a platform for the exploration of superconducting diode effect via the artificial construction of heterostructures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_04093 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Observation of superconducting diode effect in antiferromagnetic Mott insulator $α$-RuCl$_3$ He, Jiadian Ding, Yifan Zeng, Xiaohui Zhang, Yiwen Wang, Yanjiang Dong, Peng Zhou, Xiang Wu, Yueshen Cao, Kecheng Ran, Kejing Wang, Jinghui Chen, Yulin Watanabe, Kenji Taniguchi, Takashi Yu, Shun-Li Li, Jian-Xin Wen, Jinsheng Li, Jun Superconductivity Mesoscale and Nanoscale Physics Nonreciprocal superconductivity, also called as superconducting diode effect that spontaneously breaks time-reversal symmetry, is characterized by asymmetric critical currents under opposite applied current directions. This distinct state unveils a rich ore of intriguing physical properties, particularly in the realm of nanoscience application of superconductors. Towards the experimental realization of superconducting diode effect, the construction of two-dimensional heterostructures of magnets and $s$-wave superconductors is considered to be a promising pathway. In this study, we present our findings of superconducting diode effect manifested in the magnetic Mott insulator $α$-RuCl$_3$. This phenomenon is induced by the proximity effect within a van der Waals heterostructure, consisting of thin $α$-RuCl$_3$/NbSe$_2$ flakes. Through transport property measurements, we have confirmed a weak superconducting gap of 0.2 meV, which is significantly lower than the intrinsic gap of NbSe$_2$(1.2 meV). Upon the application of a weak magnetic field below 70 mT, we observed an asymmetry in the critical currents under positive and negative applied currents. This observation demonstrates a typical superconducting diode effect in the superconducting $α$-RuCl$_3$. The superconducting diode effect and nonreciprocal resistance are observed exclusively when the magnetic field is aligned out-of-plane. This suggests that an Ising-type spin-orbit coupling in the superconducting $α$-RuCl$_3$ may be responsible for the mechanism. Our findings furnish a platform for the exploration of superconducting diode effect via the artificial construction of heterostructures. |
| title | Observation of superconducting diode effect in antiferromagnetic Mott insulator $α$-RuCl$_3$ |
| topic | Superconductivity Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2409.04093 |