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Degenerate ground state in a mesoscopic YBa2Cu3O7-x grain boundary Josephson junction

被引：161
作者：
Il'ichev, E
Grajcar, M
Hlubina, R
IJsselsteijn, RPJ
Hoenig, HE
Meyer, HG
Golubov, A
Amin, MHS
Zagoskin, AM
Omelyanchouk, AN
Kupriyanov, MY
机构：
[1] Inst Phys High Technol, Dept Cryoelect, D-07702 Jena, Germany
[2] Comenius Univ, Dept Solid State Phys, Bratislava 84248, Slovakia
[3] Univ Twente, Dept Appl Phys, NL-7500 AE Enschede, Netherlands
[4] D Wave Syst Inc, Vancouver, BC V6J 4Y3, Canada
[5] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada
[6] BI Verkin Inst Low Temp Phys & Engn, UA-310164 Kharkov, Ukraine
[7] Moscow MV Lomonosov State Univ, Inst Nucl Phys, Moscow 119899, Russia
来源：
PHYSICAL REVIEW LETTERS | 2001年 / 86卷 / 23期
关键词：
D O I：
10.1103/PhysRevLett.86.5369
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We have measured the current-phase relationship I(phi) of symmetric 45 degrees, YBa2Cu3O7-x grain boundary Josephson junctions. Substantial deviations of the Josephson current from conventional tunnel-junction behavior have been observed: (i) The critical current exhibits, as a function of temperature T, a local minimum at a temperature T*. (ii) At T approximate to T*, the first harmonic of I(phi) changes sign. (iii) For T < T*, the second harmonic of I(phi) is comparable to the first harmonic, and (iv) the groundstate of the junction becomes degenerate. The results are in good agreement with a microscopic model of Josephson junctions between d-wave superconductors.
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收藏
页码：5369 / 5372
页数：4
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