RUS  ENG
Полная версия
ЖУРНАЛЫ // Успехи физических наук // Архив

УФН, 2001, том 171, приложение к № 10, страницы 81–86 (Mi ufn5637)

Эта публикация цитируется в 10 статьях

Mesoscopic superconductivity

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

V. V. Ryazanova, V. A. Oboznova, A. V. Veretennikova, A. Yu. Rusanova, A. A. Golubovb, J. Aartsc

a Intitute of Solid State Physics, Russian Academy of Sciences, 142432 Chernogolovka, Moscow Region, Russian Federation
b Department of Applied Physics, University of Twente, P.O.Box 217, 7500 AE, Enschede, the Netherlands
c Kamerlingh-Onnes Laboratory, Leiden University, P.O. Box 9504, 2300 RA, Leiden, the Netherlands

Аннотация: 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.

PACS: 74.20.-z, 74.70.-b, 74.80.-g, 03.65.Ud

Язык публикации: английский


 Англоязычная версия: Physics–Uspekhi, 2001, 44:10 suppl., s81–s86

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