The low frequency current–voltage characteristics of YBa2Cu3O7–SrRuO3–YBa2Cu3O7 Josephson junctions show an increasing resistance and phase shift in fields of 0 to 8 T. A critical current is also evident up to 8 T. Data are analyzed in terms of field-induced perturbations of the current paths through the junction. Results indicate a highly inhomogeneous interface where the mean width of spatial variations in both normal and supercurrent is of order 50 to 100 Å.
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Gausepohl et al. (1995) studied this question.