TUNNELING CHARACTERISTICS OF YBACUO/MGO/PB PLANAR TUNNEL-JUNCTIONS AND OBSERVATION OF JOSEPHSON EFFECT

被引：24
|
作者：
IGUCHI, I
FURUYAMA, M
KUSUMORI, T
SHIRAI, K
TOMURA, S
NASU, M
OHTAKE, H
机构：
[1] Institute of Materials Science, University of Tsukuba, Tsukuba, lbaraki
来源：
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS | 1990年 / 29卷 / 04期
关键词：
High T[!sub]c[!/sub]tunnel junction; Josephson effect; YBaCuO gap structure;
D O I：
10.1143/JJAP.29.L614
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The measurements on reproducible YBa2Cu3Oy(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. © 1990 IOP Publishing Ltd.
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页码：L614 / L617
页数：4
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