Abstract
We have shown by means of measurements of the current–phase relationship I( φ) of YBCO grain boundary Josephson junctions (GBJJs) that GBJJs with misorientation angles θ⩾24° are in the tunnel limit. The properties of 45° GBJJs are known to be anomalous: both symmetric and asymmetric junctions exhibit a substantial second harmonic of I( φ) and, in symmetric 45° GBJJs, a temperature-controlled sign change of the first harmonic of I( φ) has been observed. We have shown that in the tunnel limit these anomalous properties follow from the d-wave pairing symmetry of YBCO, provided the interface is sufficiently rough.
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