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Conference Contributions

Conference Contributions

22nd International Conference on Low Temperature Physics

August 4-11, 1999, Espoo and Helsinki, Finland

 
 
 

Supercurrents through the superconductor-ferromagnet-superconductor (SFS) junctions

Alexander V. Veretennikov, Valery V. Ryazanov, Vladimir A. Oboznov, Alexander Yu. Rusanov, Victor A. Larkin, Jan Aarts

We have observed and studied critical supercurrents, Ic, in cross-type Nb-Cu/Ni-Nb junctions with Josephson layers prepared from diluted ferromagnetic alloys. For suitable values of the exchange energy in the ferromagnet and the F-layer thickness we have observed Ic(T) oscillation with vanishing Ic for the definite values of T and dF.
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6th International Conference on Materials and Mechanisms of Superconductivity and High-Temperature Superconductors

February 20-25, 2000, George R. Brown Convention Center, Houston, Texas USA 
 
 
 
 

Reentrant superconducting behavior of the Josephson SFS junction. Evidence for the pi-phase state

V. V. Ryazanov, A. V. Veretennikov, V. A. Oboznov, A. Yu. Rusanov, V. A. Larkin, A. A. Golubov and J. Aarts

Critical supercurrents, Ic, in Nb-Cu(1-x)Ni(x)-Nb Josephson SFS junctions with F-layers prepared from ferromagnetic Cu(1-x)Ni(x) alloys have been studied. For value x=0.52 and particular F-layer thickness we have observed Ic(T) oscillations with Ic vanishing for some values of T. We associate this reentrant superconducting behavior with a crossover of the SFS junction from '0'- to 'pi'-state that is related to temperature dependence of spatial oscillation period of induced superconducting order parameter in the weak ferromagnet. We argue this is the first experimental evidence of the pi-behavior of a Josephson junction, that is the special feature of superconducting pair flow through a ferromagnet predicted for SFS junctions by Bulaevskii, Buzdin et al.
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