Shao-Pin Chiu , Chang-Jan Wang , Yi-Chun Lin , Shun-Tast Tu , Shouray Kumar Sahu , Ruey-Tay Wang , Chih-Yuan Wu , Sheng-Shiuan Yeh , Stefan Kirchner , Juhn-Jong Lin
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A good understanding of these features shall help to address the underlying physics of the unconventional pairing symmetry recently discovered in transparent CoSi<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>/TiSi<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> heterojunctions (Chiu et al., 2021; Chiu et al., 2023), where CoSi<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>/Si is a superconductor with a superconducting transition temperature <span><math><mrow><msub><mrow><mi>T</mi></mrow><mrow><mi>c</mi></mrow></msub><mo>≃</mo></mrow></math></span> (1.1–1.5) K, dependent on its dimensions, and TiSi<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> is a normal metal. In CoSi<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>/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<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>/TiSi<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> heterojunctions. The CoSi<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>/Si films are stable under ambient conditions and have ultralow 1/<span><math><mi>f</mi></math></span> 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.</p></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":null,"pages":null},"PeriodicalIF":4.6000,"publicationDate":"2024-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0577907324001540/pdfft?md5=051112502dc5a6a047f628a895d72fa6&pid=1-s2.0-S0577907324001540-main.pdf","citationCount":"0","resultStr":"{\"title\":\"Electronic and superconducting properties of CoSi2 films on silicon — An unconventional superconductor with technological potential\",\"authors\":\"Shao-Pin Chiu , Chang-Jan Wang , Yi-Chun Lin , Shun-Tast Tu , Shouray Kumar Sahu , Ruey-Tay Wang , Chih-Yuan Wu , Sheng-Shiuan Yeh , Stefan Kirchner , Juhn-Jong Lin\",\"doi\":\"10.1016/j.cjph.2024.04.018\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>We report the observation of unusual normal-state electronic conduction properties and superconducting characteristics of high-quality CoSi<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>/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 discovered in transparent CoSi<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>/TiSi<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> heterojunctions (Chiu et al., 2021; Chiu et al., 2023), where CoSi<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>/Si is a superconductor with a superconducting transition temperature <span><math><mrow><msub><mrow><mi>T</mi></mrow><mrow><mi>c</mi></mrow></msub><mo>≃</mo></mrow></math></span> (1.1–1.5) K, dependent on its dimensions, and TiSi<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> is a normal metal. In CoSi<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>/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<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>/TiSi<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> heterojunctions. The CoSi<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>/Si films are stable under ambient conditions and have ultralow 1/<span><math><mi>f</mi></math></span> noise. 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Electronic and superconducting properties of CoSi2 films on silicon — An unconventional superconductor with technological potential
We report the observation of unusual normal-state electronic conduction properties and superconducting characteristics of high-quality CoSi/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 discovered in transparent CoSi/TiSi heterojunctions (Chiu et al., 2021; Chiu et al., 2023), where CoSi/Si is a superconductor with a superconducting transition temperature (1.1–1.5) K, dependent on its dimensions, and TiSi is a normal metal. In CoSi/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/TiSi heterojunctions. The CoSi/Si films are stable under ambient conditions and have ultralow 1/ 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.
期刊介绍:
The Chinese Journal of Physics publishes important advances in various branches in physics, including statistical and biophysical physics, condensed matter physics, atomic/molecular physics, optics, particle physics and nuclear physics.
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