Absence of diode effect in chiral type-I superconductor NbGe2
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866909513824600064 |
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| author | Li, Dong Lu, Zouyouwei Cheng, Wenxin Shi, Xiaofan Hu, Lihong Ma, Xiaoping Liu, Yue Itahashi, Yuki M. Shitaokoshi, Takashi Li, Peiling Zhang, Hua Liu, Ziyi Qu, Fanming Shen, Jie Chen, Qihong Jin, Kui Cheng, Jinguang Hänisch, Jens Yang, Huaixin Liu, Guangtong Lu, Li Dong, Xiaoli Iwasa, Yoshihiro Hu, Jiangping |
| author_facet | Li, Dong Lu, Zouyouwei Cheng, Wenxin Shi, Xiaofan Hu, Lihong Ma, Xiaoping Liu, Yue Itahashi, Yuki M. Shitaokoshi, Takashi Li, Peiling Zhang, Hua Liu, Ziyi Qu, Fanming Shen, Jie Chen, Qihong Jin, Kui Cheng, Jinguang Hänisch, Jens Yang, Huaixin Liu, Guangtong Lu, Li Dong, Xiaoli Iwasa, Yoshihiro Hu, Jiangping |
| contents | Symmetry elegantly governs the fundamental properties and derived functionalities of condensed matter. For instance, realizing the superconducting diode effect (SDE) demands breaking space-inversion and time-reversal symmetries simultaneously. Although the SDE is widely observed in various platforms, its underlying mechanism remains debated, particularly regarding the role of vortices. Here, we systematically investigate the nonreciprocal transport in the chiral type-I superconductor NbGe2. Moreover, we induce type-II superconductivity with elevated superconducting critical temperature on the artificial surface by focused ion beam irradiation, enabling control over vortex dynamics in NbGe2 devices. Strikingly, we observe negligible diode efficiency (Q < 2%) at low magnetic fields, which rises significantly to Q ~ 50% at high magnetic fields, coinciding with an abrupt increase in vortex creep rate when the superconductivity of NbGe2 bulk is suppressed. These results unambiguously highlight the critical role of vortex dynamics in the SDE, in addition to the established symmetry rules. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_09226 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Absence of diode effect in chiral type-I superconductor NbGe2 Li, Dong Lu, Zouyouwei Cheng, Wenxin Shi, Xiaofan Hu, Lihong Ma, Xiaoping Liu, Yue Itahashi, Yuki M. Shitaokoshi, Takashi Li, Peiling Zhang, Hua Liu, Ziyi Qu, Fanming Shen, Jie Chen, Qihong Jin, Kui Cheng, Jinguang Hänisch, Jens Yang, Huaixin Liu, Guangtong Lu, Li Dong, Xiaoli Iwasa, Yoshihiro Hu, Jiangping Superconductivity Mesoscale and Nanoscale Physics Symmetry elegantly governs the fundamental properties and derived functionalities of condensed matter. For instance, realizing the superconducting diode effect (SDE) demands breaking space-inversion and time-reversal symmetries simultaneously. Although the SDE is widely observed in various platforms, its underlying mechanism remains debated, particularly regarding the role of vortices. Here, we systematically investigate the nonreciprocal transport in the chiral type-I superconductor NbGe2. Moreover, we induce type-II superconductivity with elevated superconducting critical temperature on the artificial surface by focused ion beam irradiation, enabling control over vortex dynamics in NbGe2 devices. Strikingly, we observe negligible diode efficiency (Q < 2%) at low magnetic fields, which rises significantly to Q ~ 50% at high magnetic fields, coinciding with an abrupt increase in vortex creep rate when the superconductivity of NbGe2 bulk is suppressed. These results unambiguously highlight the critical role of vortex dynamics in the SDE, in addition to the established symmetry rules. |
| title | Absence of diode effect in chiral type-I superconductor NbGe2 |
| topic | Superconductivity Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2501.09226 |