Journal
PHYSICAL REVIEW LETTERS
Volume 86, Issue 11, Pages 2427-2430Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.86.2427
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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.
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