Tunneling Characteristics of YBaCuO/MgO/Pb Planar Tunnel Junctions and Observation of Josephson Effect
| Autor: | Koji Shirai, Hiroaki Ohtake, Shoji Tomura, Masako Nasu, Ienari Iguchi, Takeshi Kusumori, Masafumi Furuyama |
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| Rok vydání: | 1990 |
| Předmět: |
Josephson effect
Materials science High-temperature superconductivity Condensed matter physics Solid-state physics General Engineering General Physics and Astronomy Heterojunction Condensed Matter::Mesoscopic Systems and Quantum Hall Effect law.invention Magnetic field Pi Josephson junction law Condensed Matter::Superconductivity Thin film Quantum tunnelling |
| Zdroj: | Japanese Journal of Applied Physics. 29:L614 |
| ISSN: | 1347-4065 0021-4922 |
| DOI: | 10.1143/jjap.29.l614 |
| Popis: | The measurements on reproducible YBa2Cu3O y (YBCO)/MgO/Pb planar tunnel junctions by an in situ fabrication technique are reported. A thin MgO (1.8–6.0 nm) is used as an insulating barrier. The observed tunnel characteristics exhibit a gap opening structure around 20 mV and the zero bias anomaly, similar to those of YBCO/MgO/Au tunnel junctions as previously reported. For junctions with low tunnel resistance, Josephson current is observed. Josephson critical current against external magnetic field exhibits a Fraunhofer-like pattern. Shapiro steps are also observed under microwave irradiation. |
| Databáze: | OpenAIRE |
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