Emergent ferromagnetism with superconductivity in Fe(Te,Se) van der Waals Josephson junctions
Abstract Ferromagnetism and superconductivity are two key ingredients for topological superconductors, which can serve as building blocks of fault-tolerant quantum computers. Adversely, ferromagnetism and superconductivity are typically also two hostile orderings competing to align spins in differen...
| Main Authors: | , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2023-10-01
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| Series: | Nature Communications |
| Online Access: | https://doi.org/10.1038/s41467-023-42447-4 |
| _version_ | 1797558753125466112 |
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| author | Gang Qiu Hung-Yu Yang Lunhui Hu Huairuo Zhang Chih-Yen Chen Yanfeng Lyu Christopher Eckberg Peng Deng Sergiy Krylyuk Albert V. Davydov Ruixing Zhang Kang L. Wang |
| author_facet | Gang Qiu Hung-Yu Yang Lunhui Hu Huairuo Zhang Chih-Yen Chen Yanfeng Lyu Christopher Eckberg Peng Deng Sergiy Krylyuk Albert V. Davydov Ruixing Zhang Kang L. Wang |
| author_sort | Gang Qiu |
| collection | DOAJ |
| description | Abstract Ferromagnetism and superconductivity are two key ingredients for topological superconductors, which can serve as building blocks of fault-tolerant quantum computers. Adversely, ferromagnetism and superconductivity are typically also two hostile orderings competing to align spins in different configurations, and thus making the material design and experimental implementation extremely challenging. A single material platform with concurrent ferromagnetism and superconductivity is actively pursued. In this paper, we fabricate van der Waals Josephson junctions made with iron-based superconductor Fe(Te,Se), and report the global device-level transport signatures of interfacial ferromagnetism emerging with superconducting states for the first time. Magnetic hysteresis in the junction resistance is observed only below the superconducting critical temperature, suggesting an inherent correlation between ferromagnetic and superconducting order parameters. The 0-π phase mixing in the Fraunhofer patterns pinpoints the ferromagnetism on the junction interface. More importantly, a stochastic field-free superconducting diode effect was observed in Josephson junction devices, with a significant diode efficiency up to 10%, which unambiguously confirms the spontaneous time-reversal symmetry breaking. Our work demonstrates a new way to search for topological superconductivity in iron-based superconductors for future high Tc fault-tolerant qubit implementations from a device perspective. |
| first_indexed | 2024-03-10T17:35:57Z |
| format | Article |
| id | doaj.art-ca9b84813627401bb74c7022d44550f4 |
| institution | Directory Open Access Journal |
| issn | 2041-1723 |
| language | English |
| last_indexed | 2024-03-10T17:35:57Z |
| publishDate | 2023-10-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Nature Communications |
| spelling | doaj.art-ca9b84813627401bb74c7022d44550f42023-11-20T09:51:57ZengNature PortfolioNature Communications2041-17232023-10-011411910.1038/s41467-023-42447-4Emergent ferromagnetism with superconductivity in Fe(Te,Se) van der Waals Josephson junctionsGang Qiu0Hung-Yu Yang1Lunhui Hu2Huairuo Zhang3Chih-Yen Chen4Yanfeng Lyu5Christopher Eckberg6Peng Deng7Sergiy Krylyuk8Albert V. Davydov9Ruixing Zhang10Kang L. Wang11Department of Electrical and Computer Engineering, University of CaliforniaDepartment of Electrical and Computer Engineering, University of CaliforniaDepartment of Physics & Astronomy, The University of Tennessee, KnoxvilleMaterials Science and Engineering Division, National Institute of Standards and Technology (NIST)Department of Electrophysics, National Yang Ming Chiao Tung University (NYCU)School of Science, Nanjing University of Posts and TelecommunicationsDepartment of Electrical and Computer Engineering, University of CaliforniaDepartment of Electrical and Computer Engineering, University of CaliforniaMaterials Science and Engineering Division, National Institute of Standards and Technology (NIST)Materials Science and Engineering Division, National Institute of Standards and Technology (NIST)Department of Physics & Astronomy, The University of Tennessee, KnoxvilleDepartment of Electrical and Computer Engineering, University of CaliforniaAbstract Ferromagnetism and superconductivity are two key ingredients for topological superconductors, which can serve as building blocks of fault-tolerant quantum computers. Adversely, ferromagnetism and superconductivity are typically also two hostile orderings competing to align spins in different configurations, and thus making the material design and experimental implementation extremely challenging. A single material platform with concurrent ferromagnetism and superconductivity is actively pursued. In this paper, we fabricate van der Waals Josephson junctions made with iron-based superconductor Fe(Te,Se), and report the global device-level transport signatures of interfacial ferromagnetism emerging with superconducting states for the first time. Magnetic hysteresis in the junction resistance is observed only below the superconducting critical temperature, suggesting an inherent correlation between ferromagnetic and superconducting order parameters. The 0-π phase mixing in the Fraunhofer patterns pinpoints the ferromagnetism on the junction interface. More importantly, a stochastic field-free superconducting diode effect was observed in Josephson junction devices, with a significant diode efficiency up to 10%, which unambiguously confirms the spontaneous time-reversal symmetry breaking. Our work demonstrates a new way to search for topological superconductivity in iron-based superconductors for future high Tc fault-tolerant qubit implementations from a device perspective.https://doi.org/10.1038/s41467-023-42447-4 |
| spellingShingle | Gang Qiu Hung-Yu Yang Lunhui Hu Huairuo Zhang Chih-Yen Chen Yanfeng Lyu Christopher Eckberg Peng Deng Sergiy Krylyuk Albert V. Davydov Ruixing Zhang Kang L. Wang Emergent ferromagnetism with superconductivity in Fe(Te,Se) van der Waals Josephson junctions Nature Communications |
| title | Emergent ferromagnetism with superconductivity in Fe(Te,Se) van der Waals Josephson junctions |
| title_full | Emergent ferromagnetism with superconductivity in Fe(Te,Se) van der Waals Josephson junctions |
| title_fullStr | Emergent ferromagnetism with superconductivity in Fe(Te,Se) van der Waals Josephson junctions |
| title_full_unstemmed | Emergent ferromagnetism with superconductivity in Fe(Te,Se) van der Waals Josephson junctions |
| title_short | Emergent ferromagnetism with superconductivity in Fe(Te,Se) van der Waals Josephson junctions |
| title_sort | emergent ferromagnetism with superconductivity in fe te se van der waals josephson junctions |
| url | https://doi.org/10.1038/s41467-023-42447-4 |
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