INVESTIGATION OF YBCO STEP-EDGE JOSEPHSON JUNCTIONS

被引：22

作者：

Siegel, M. ^{[1
]}

Herrmann, K. ^{[1
]}

Copetti, C. ^{[1
]}

Jia, C. L. ^{[2
]}

Kabius, B. ^{[2
]}

Schubert, J. ^{[1
]}

Zander, W. ^{[1
]}

Braginski, A. I. ^{[1
]}

Seidel, P. ^{[3
]}

机构：

[1] Forschungszentrum Julich KFA, Inst Schicht & Ionentech, POB 1913, D-5170 Julich, Germany

[2] Forschungszentrum Julich KFA, Inst Festkorperforsch, POB 1913, D-5170 Julich, Germany

[3] Univ Jena, Inst Festkorperphys, Helmholtzweg 5, D-6900 Jena, Germany

来源：

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 1993年 / 3卷 / 01期

关键词：

D O I：

10.1109/77.233425

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We report on the superconducting transport properties of YBa2Cu3O7 Josephson junctions fabricated by pulsed laser deposition on steep steps in epitaxial substrates. The steps were prepared by Ar-ion milling. The YBa2Cu3O7 thin films were patterned either by Ar-ion milling or an inhibit process. The current-voltage characteristics of step-edge junctions (SEJ) fit approximately the RSJ (Stewart-McCumber) model up to temperatures of 85K. The temperature dependence of the characteristic voltage can be explained by a SNS-type model. Simulations of Shapiro steps were performed. The simulations, the form of the I(V) curves, the I-C(H) curves and the dc-SQUID quantization properties all suggest that a SEJ consists of two weak links in series formed by the grain boundaries at the lower and upper edges of the steps. This conclusion is in good agreement with HREM results, which show that the upper and lower grain boundaries at the step edge are different. Each of these weak links is a parallel array of Josephson junctions with different current densities.

引用

页码：2369 / 2372

页数：4

共 14 条

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