Coupling of two superconductors through a ferromagnet: evidence for a pi junction.

By V. Ryazanov, V. Oboznov, A. Rusanov, A. Veretennikov, A. Golubov, J. Aarts. Physical Review Letters, 2000

848 citations recorded by the source corpus.

We report measurements of the temperature dependence of the critical current, I(c), in Josephson junctions consisting of conventional superconducting banks of Nb and a weakly ferromagnetic interlayer of a CuxNi1-x alloy, with x around 0.5. With decreasing temperature I(c) generally increases, but for specific thicknesses of the ferromagnetic interlayer, a maximum is found followed by a strong decrease down to zero, after which I(c) rises again. Such a sharp cusp can be explained only by assuming that the junction changes from a 0-phase state at high temperatures to a pi phase state at low temperatures.

Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/77586a97eed86b350413f5e2d9ec12f2b1e2358c

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In Atomic and Molecular Physics, and Optics

1. A. Buzdin
2. V. Ryazanov
3. F. Bergeret
4. K. Efetov
5. A. Volkov
6. E. Il'ichev
7. M. Silaev
8. Pauli Virtanen

In Condensed Matter Physics

1. F. Bergeret
2. K. Efetov
3. A. Volkov
4. X. Xi
5. A. Buzdin
6. V. Ryazanov
7. M. Silaev
8. Pauli Virtanen

In Electronic, Optical and Magnetic Materials

1. F. Bergeret
2. K. Efetov
3. A. Volkov
4. X. Xi
5. A. Buzdin
6. V. Ryazanov
7. T. Heikkilä
8. M. Silaev

Citations in the corpus

• Colloquium : Nonequilibrium effects in superconductors with a spin-splitting field (2017, background): “Much later, an analogue of this effect was measured in the oscillations of the critical current through a magnetic weak link (Kontos et al., 2001; Ryazanov et al., 2001).”
• Nucleation of superconductivity and vortex matter in superconductor–ferromagnet hybrids (2009, background): “junctions with an arbitrary phase difference between the superconducting electrodes, which depend on the thickness of the ferromagnetic layer (see, e.g., papers of Proki´c et al. [16], Ryazanov et al. [17], Kontos et al. [18], Buzdin and Baladie [19], Oboznov et al. [20] and references therein). The ”
• Proximity effect in superconductor-ferromagnet heterostructures (2005, methodology): “In this context, the calculations of the free energy of S/F structures in the framework of the standard Ginzburg-Landau functional (Ryazanov et al., 2001a; Ryazanov et al., 2001b) can not be justified.”
• Odd triplet superconductivity and related phenomena in superconductor-ferromagnet structures (2005, methodology): “Another manifestation of the transition from the 0- state to the π- state is the sign reversal of the critical current observed in the experiment by Ryazanov et al. (2001) on Nb/CuxNi1−x/Nb Josephson junctions (see FIG.”
• Implementation of superconductor/ferromagnet/ superconductor [pi]-shifters in superconducting digital and quantum circuits (2010, methodology): “The π-junctions were theoretically proposed about three decades ago [1, 2], whereas their remarkable properties have been demonstrated in experiments notably later [3, 6, 7].”
• Two-band superconductor magnesium diboride (2008, background): “dependence of Tc on the thickness of the F layer [263, 264] and the π junctions in the S/F/S structures [265, 266] will have a”
• The current-phase relation in Josephson junctions (2004, methodology): “Until now, only a planar geometry has been realized in experiments by Ryazanov et al. (2000, 2001a, 2001b, 2002), Blum et al. (2002), Kontos et al. (2002), and Surgers et al. (2002).”