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Mesoscopic superconductivity


Coupling of two superconductors through a ferromagnet. SFS $\pi$-junctions and intrinsically-frustrated superconducting networks

 а,  а,  а,  а,  б,  в
а Институт физики твердого тела имени Ю.А. Осипьяна РАН, ул. Академика Осипьяна 2, Черноголовка, Московская обл., 142432, Российская Федерация
б University of Twente, AE Enschede Twente 7500 The Netherlands , Twente, Нидерланды
в Leiden University, Leiden, The Netherlands

Reentrant superconducting behavior of the critical supercurrent temperature dependencies has been observed for the Nb-Cu/Ni-Nb Josephson SFS (superconductor–ferromagnet–superconductor) junctions. The $I_{\mathrm{c}}(T)$ oscillations detected are associated with a crossover of the SFS junctions from '$0$'- to '$\pi$'-state that is related to a special feature of superconducting pair flow through a ferromagnet (spatial oscillations of induced superconducting order parameter in presence of the exchange field). A triangular array of the junctions in the $\pi$-state shows evidence for a phase shift of $\pi$ on the $I_{\mathrm{c}}(H)$ dependence. We have argued advantages of the SFS $\pi$-junction use for the quantum bit implementation based on the superconducting loop with quantum Josephson junctions. While designs proposed previously are based on magnetically frustrated superconducting loops, we discuss the advantages offered by the $\pi$-junctions in obtaining naturally degenerate two-level systems.

Текст pdf (226 Кб)
English fulltext is available at DOI: 10.1070/1063-7869/44/10S/S18
PACS: 74.20.−z, 74.70.−b, 74.80.-g, 03.65.Ud (все)
DOI: 10.1070/1063-7869/44/10S/S18
URL: https://ufn.ru/ru/articles/2001/13/r/
Цитата: Ryazanov V V, Oboznov V A, Veretennikov A V, Rusanov A Yu, Golubov A A, Aarts J "Coupling of two superconductors through a ferromagnet. SFS $\pi$-junctions and intrinsically-frustrated superconducting networks" УФН 171 81–86 (2001)
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Русский English
@article{Ryazanov:2001,
	author = {V. V. Ryazanov and V. A. Oboznov and A. V. Veretennikov and A. Yu. Rusanov and A. A. Golubov and J. Aarts},
	title = {Coupling of two superconductors through a ferromagnet. SFS $\pi$-junctions and intrinsically-frustrated superconducting networks},
	publisher = {Успехи физических наук},
	year = {2001},
	journal = {Усп. физ. наук},
	volume = {171},
	number = {13},
	pages = {81-86},
	url = {https://ufn.ru/ru/articles/2001/13/r/},
	doi = {10.1070/1063-7869/44/10S/S18}
}

English citation: Ryazanov V V, Oboznov V A, Veretennikov A V, Rusanov A Yu, Golubov A A, Aarts J “Coupling of two superconductors through a ferromagnet. SFS $\pi$-junctions and intrinsically-frustrated superconducting networksPhys. Usp. 44 81–86 (2001); DOI: 10.1070/1063-7869/44/10S/S18

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