Issues

 / 

2001

 / 

Supplement

  

Mesoscopic superconductivity


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

 a,  a,  a,  a,  b,  c
a Osipyan Institute of Solid State Physics, Russian Academy of Sciences, Akademika Osip'yana str. 2, Chernogolovka, Moscow Region, 142432, Russian Federation
b University of Twente, AE Enschede, Twente, 7500, The Netherlands , Twente , The Netherlands
c 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.

Fulltext pdf (226 KB)
Fulltext is also available at DOI: 10.1070/1063-7869/44/10S/S18
PACS: 74.20.−z, 74.70.−b, 74.80.-g, 03.65.Ud (all)
DOI: 10.1070/1063-7869/44/10S/S18
URL: https://ufn.ru/en/articles/2001/13/r/
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 networks" Phys. Usp. 44 81–86 (2001)
BibTexBibNote ® (generic) BibNote ® (RIS)MedlineRefWorks
TY JOUR
TI Coupling of two superconductors through a ferromagnet. SFS $\pi$-junctions and intrinsically-frustrated superconducting networks
AU Ryazanov, V. V.
AU Oboznov, V. A.
AU Veretennikov, A. V.
AU Rusanov, A. Yu.
AU Golubov, A. A.
AU Aarts, J.
PB Physics-Uspekhi
PY 2001
JO Physics-Uspekhi
JF Physics-Uspekhi
JA Phys. Usp.
VL 44
IS 13
SP 81-86
UR https://ufn.ru/en/articles/2001/13/r/
ER https://doi.org/10.1070/1063-7869/44/10S/S18

Îðèãèíàë: 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» ÓÔÍ 171 81–86 (2001); DOI: 10.1070/1063-7869/44/10S/S18

© 1918–2024 Uspekhi Fizicheskikh Nauk
Email: ufn@ufn.ru Editorial office contacts About the journal Terms and conditions