Measurement of the current-phase relation of superconductor/ferromagnet/superconductor π Josephson junctions -: art. no. 144505

被引：131
作者：
Frolov, SM
Van Harlingen, DJ
Oboznov, VA
Bolginov, VV
Ryazanov, VV
机构：
[1] Univ Illinois, Dept Phys, Urbana, IL 61801 USA
[2] Russian Acad Sci, Inst Solid State Phys, Chernogolovka 142432, Russia
来源：
PHYSICAL REVIEW B | 2004年 / 70卷 / 14期
基金：
美国国家科学基金会;
关键词：
D O I：
10.1103/PhysRevB.70.144505
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We present measurements of the current-phase relation (CPR) of superconductor-ferromagnet-superconductor (SFS) Josephson junctions as a function of temperature. The CPR is determined by incorporating the junction into a superconducting loop coupled to a dc SQUID, allowing measurement of the junction phase difference. We find that the critical current of Nb-Cu0.47Ni0.53-Nb Josephson junctions with barrier thickness similar to22 nm changes sign at T<T(pi)similar to2-4 K, indicating that the junction becomes a pi Josephson junction. We find no evidence for second-order Josephson tunneling near T-pi in the CPR predicted by several theories.
引用
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页码：144505 / 1
页数：5
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