Monotonic decrease ofTcs with thinning of the superconducting MgB2layer in MgB2/Ni and MgB2/B alternately-layered thin films
| Autor: | Noriyuki Kuwano, Yoshinori Hakuraku, Satoshi Hata, K. Fukuyama, Hitoshi Kitaguchi, Kenichiro Takahashi, T. Doi, K. Masuda, Takeshi Yoshidome |
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| Rok vydání: | 2007 |
| Předmět: |
Superconductivity
Materials science business.industry Metals and Alloys Vacuum arc Condensed Matter Physics Evaporation (deposition) Electron beam physical vapor deposition Optics Materials Chemistry Ceramics and Composites Electrical and Electronic Engineering Thin film Composite material Coaxial business Electron microscopic Layer (electronics) |
| Zdroj: | Superconductor Science and Technology. 20:1223-1227 |
| ISSN: | 1361-6668 0953-2048 |
| Popis: | We prepared MgB2/Ni and MgB2/B alternately-layered films using electron beam evaporation and coaxial vacuum arc evaporation techniques without any post-annealing. The thickness of each MgB2 layer was designed to be 42, 24 or 15 nm for both MgB2/Ni and MgB2/B alternately-layered films. We confirmed that the layered structure was successfully obtained from the scanning transmission electron microscopic cross-sectional image of the MgB2/Ni alternately-layered film. The critical temperature, Tc, of the alternately-layered film decreased as the MgB2 layer became thinner, for both MgB2/Ni and MgB2/B films. Moreover, the Tc was affected by only the MgB2 layer thickness, and was independent of the inserted layer materials. |
| Databáze: | OpenAIRE |
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