Electronic conduction and superconducting properties of CoSi$_2$ films on silicon--an unconventional superconductor with technological potential
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arXiv
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| Natura: | Preprint |
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2024
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| author | Chiu, Shao-Pin Wang, Chang-Jan Lin, Yi-Chun Tu, Shun-Tast Sahu, Shouray Wang, Ruey-Tay Wu, Chih-Yuan Yeh, Sheng-Shiuan Kirchner, Stefan Lin, Juhn-Jong |
| author_facet | Chiu, Shao-Pin Wang, Chang-Jan Lin, Yi-Chun Tu, Shun-Tast Sahu, Shouray Wang, Ruey-Tay Wu, Chih-Yuan Yeh, Sheng-Shiuan Kirchner, Stefan Lin, Juhn-Jong |
| contents | We report observations of unusual normal-state electronic conduction properties and superconducting characteristics of high-quality CoSi$_2$/Si films grown on silicon Si(100) and Si(111) substrates. A good understanding of these features shall help to address the underlying physics of the unconventional pairing symmetry recently observed in transparent CoSi$_2$/TiSi$_2$ heterojunctions [S. P. Chiu \textit{et al.}, Sci. Adv. \textbf{7}, eabg6569 (2021); Nanoscale \textbf{15}, 9179 (2023)], where CoSi$_2$/Si is a superconductor with a superconducting transition temperature $T_c \simeq$ (1.1--1.5) K, dependent on its dimensions, and TiSi$_2$ is a normal metal. In CoSi$_2$/Si films, we find a pronounced positive magnetoresistance caused by the weak-antilocalization effect, indicating a strong Rashba spin-orbit coupling (SOC). This SOC generates two-component superconductivity in CoSi$_2$/TiSi$_2$ heterojunctions. The CoSi$_2$/Si films are stable under ambient conditions and have ultralow 1/$f$ noise. Moreover, they can be patterned via the standard lithography techniques, which might be of considerable practical value for future scalable superconducting and quantum device fabrication. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2401_17601 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Electronic conduction and superconducting properties of CoSi$_2$ films on silicon--an unconventional superconductor with technological potential Chiu, Shao-Pin Wang, Chang-Jan Lin, Yi-Chun Tu, Shun-Tast Sahu, Shouray Wang, Ruey-Tay Wu, Chih-Yuan Yeh, Sheng-Shiuan Kirchner, Stefan Lin, Juhn-Jong Superconductivity Mesoscale and Nanoscale Physics We report observations of unusual normal-state electronic conduction properties and superconducting characteristics of high-quality CoSi$_2$/Si films grown on silicon Si(100) and Si(111) substrates. A good understanding of these features shall help to address the underlying physics of the unconventional pairing symmetry recently observed in transparent CoSi$_2$/TiSi$_2$ heterojunctions [S. P. Chiu \textit{et al.}, Sci. Adv. \textbf{7}, eabg6569 (2021); Nanoscale \textbf{15}, 9179 (2023)], where CoSi$_2$/Si is a superconductor with a superconducting transition temperature $T_c \simeq$ (1.1--1.5) K, dependent on its dimensions, and TiSi$_2$ is a normal metal. In CoSi$_2$/Si films, we find a pronounced positive magnetoresistance caused by the weak-antilocalization effect, indicating a strong Rashba spin-orbit coupling (SOC). This SOC generates two-component superconductivity in CoSi$_2$/TiSi$_2$ heterojunctions. The CoSi$_2$/Si films are stable under ambient conditions and have ultralow 1/$f$ noise. Moreover, they can be patterned via the standard lithography techniques, which might be of considerable practical value for future scalable superconducting and quantum device fabrication. |
| title | Electronic conduction and superconducting properties of CoSi$_2$ films on silicon--an unconventional superconductor with technological potential |
| topic | Superconductivity Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2401.17601 |