Coexistence of stable and metastable 0 and π states in Josephson junctions -: art. no. 214512
Coexistence of stable and metastable 0 and π states in Josephson junctions -: art. no. 214512
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DOI：
10.1103/physrevb.63.214512
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发表时间：
2001-06-01
影响因子：
3.7
通讯作者：
Vujicic, B
中科院分区：
文献类型：
--
作者：
Radovic, Z;Dobrosavljevic-Grujic, L;Vujicic, B
从理论上预测了具有铁磁结的超导量子干涉装置（SQUID）中磁通穿透的新模式。电流-相位关系的特征多节点非和谐性意味着在低温下铁磁势垒影响的大强度区间内稳定和亚稳态 0 和 pi 状态共存。因此，整数和半整数磁通配置的共存出现在 rf 和 de SQUID 中，并且每个外部磁通量子产生两个磁通跳跃。在 de SQUID 中，新的磁通跳跃表现为依赖于外部磁通量的临界电流的两次下降。
New modes of the magnetic-flux penetration in superconducting quantum interference devices (SQUID's) with ferromagnetic junctions are predicted theoretically. Characteristic multinode anharmonicity of the current-phase relation implies the coexistence of stable and metastable 0 and pi states for a large interval of strength of the ferromagnetic barrier influence at low temperature. As a consequence, the coexistence of integer and half-integer fluxoid configurations appears in both rf and de SQUID's and generates two flux jumps per one external flux quantum. In de SQUID's, new flux jumps are manifested as two dips in the critical current dependence on the external magnetic flux.