Improved characteristics of mesa-type intrinsic Josephson junctions by vacuum cleavage process for Bi2Sr2CaCu2O8+δ/Au contacts

被引：1
作者：
Ishida, Hiroki [1 ]
Kato, Takahiro [2 ]
Saito, Atsushi [3 ]
Yasui, Kanji [2 ]
机构：
[1] Toyama Natl Coll Technol, Dept Elect & Comp Engn, Toyama 9330293, Japan
[2] Nagaoka Univ Technol, Dept Elect Engn, Nagaoka, Niigata 9402188, Japan
[3] Yamagata Univ, Grad Sch Sci & Engn, Yonezawa, Yamagata 9928510, Japan
来源：
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A | 2012年 / 30卷 / 03期
关键词：
SINGLE-CRYSTALS; STACKS; NOISE; FABRICATION; DEPENDENCE; BI-2212; GAP;
D O I：
10.1116/1.4707151
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Improvement in the quality of stacked intrinsic Josephson junctions (IJJs) was attempted using Bi2Sr2CaCu2O8+delta (Bi-2212) single crystals. The introduction of a clean Bi-2212/Au interface reduced contact resistivity (rho(c)), decreased low frequency noise, and suppressed the drop in the maximum Josephson current (I-c), which are very important factors for applications such as a superconducting quantum interference device. The rho(c) of samples produced by crystal cleavage in air or vacuum were, respectively, 8.2 x 10(-5) and 7.0 x 10(-6) Omega cm(2) at 300 K and 8.2 x 10(-5) and 2.1 x 10(-6) Omega cm(2) at 77 K. Random-telegraph voltage noise observed with the air-cleaved samples did not occur for the samples cleaved in a vacuum. The degradation of I-c was suppressed for IJJs produced by the vacuum cleavage process. (C) 2012 American Vacuum Society. [http://dx.doi.org/10.1116/1.4707151]
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页数：7
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