Highly anisotropic supercurrent transport in YBa2Cu3O7-δ bicrystal Josephson junctions

被引：27

作者：

Ivanov, ZG ^{[1
]}

Stepantsov, EA

Claeson, T

Wenger, F

Lin, SY

Khare, N

Chaudhari, P

机构：

[1] Chalmers Univ Technol, Dept Microelect & Nanosci, MINA, S-41296 Gothenburg, Sweden

[2] Univ Gothenburg, S-41296 Gothenburg, Sweden

[3] Chalmers Univ Technol, Inst Theoret Phys, S-41296 Gothenburg, Sweden

[4] Univ Karlstad, Dept Nat Sci, S-65188 Karlstad, Sweden

[5] IBM Corp, Thomas J Watson Res Ctr, Yorktown Heights, NY 10598 USA

来源：

PHYSICAL REVIEW B | 1998年 / 57卷 / 01期

关键词：

D O I：

10.1103/PhysRevB.57.602

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report tunneling measurements on a large number of bicrystal YBa2Cu3O7-delta Josephson junctions. The orientations of the bicrystals relative to their boundary was varied over 80 degrees while the misorientation angle was kept fixed at 32 degrees. A strong anisotropy in the characteristic voltage IcRn of the Josephson junctions in the a-b plane was observed. IcRn's varied from about 80 to 2300 mu V at 4 K. The theoretical analysis shows that this variation may be explained as a combined effect of the presence of nodes in the gap function, either a generalized s wave with eight nodes or a d(x2-y2) wave, and anisotropy of the tunneling matrix elements.

引用

页码：602 / 607

页数：6

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