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
收藏
页码：602 / 607
页数：6
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