| Presentation | 2015-10-09 Evaluation and Analysis of Nb/Al/AlOx/Al/Nb Junctions Mizuki Ikeya, Takafumi Kojima, Noguchi Takashi, Takeshi Sakai, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | We are developing an ultra-wideband receiver for upgrading ALMA (Atacama Large Millimeter/submillimeter Array) receivers. In the development, Superconductor/Insulator/Superconductor (SIS) mixer with high critical current density is most important component. However it is difficult to fabricate it so that an insulator layer is very thin and likely to be with defects. In conventional structure Nb/Al/AlOx/Nb, leakage current could be increased by producing lower Nb Oxide on insulator when sputtering counter Nb layer. So Nb/Al/AlOx/Al/Nb junctions are adopted to reduce leakage current. The measured I-V characteristics showed that leakage current of the junction with an upper Al layer was small when compared to the junction without the upper Al layer. The gap voltage and leakage current degraded as the increase of thickness of the upper Al layer. Analysis about leakage current by fitting I-V characteristics are reported. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | SIS Junctions / Niobium / Al |
| Paper # | SCE2015-34 |
| Date of Issue | 2015-10-01 (SCE) |
| Conference Information | |
| Committee | SCE |
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| Conference Date | 2015/10/8(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Tohoku Univ. |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Chair | Nobuyuki Yoshikawa(Yokohama National Univ.) |
| Vice Chair | |
| Secretary | (Yokohama National Univ.) |
| Assistant | Hiroyuki Akaike(Nagoya Univ.) |
| Paper Information | |
| Registration To | Technical Committee on Superconductive Electronics |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Evaluation and Analysis of Nb/Al/AlOx/Al/Nb Junctions |
| Sub Title (in English) | |
| Keyword(1) | SIS Junctions |
| Keyword(2) | Niobium |
| Keyword(3) | Al |
| 1st Author's Name | Mizuki Ikeya |
| 1st Author's Affiliation | The University of Electro-Communications(UEC) |
| 2nd Author's Name | Takafumi Kojima |
| 2nd Author's Affiliation | National Astronomical Observatory of Japan(NAOJ) |
| 3rd Author's Name | Noguchi Takashi |
| 3rd Author's Affiliation | National Astronomical Observatory of Japan(NAOJ) |
| 4th Author's Name | Takeshi Sakai |
| 4th Author's Affiliation | The University of Electro-Communications(UEC) |
| Date | 2015-10-09 |
| Paper # | SCE2015-34 |
| Volume (vol) | vol.115 |
| Number (no) | SCE-242 |
| Page | pp.pp.75-79(SCE), |
| #Pages | 5 |
| Date of Issue | 2015-10-01 (SCE) |