Experimental test for subdominant superconducting phases with complex order parameters in cuprate grain boundary junctions

Details Experimental test for subdominant superconducting phases with complex order parameters in cuprate grain boundary junctions Experimental test for subdominant superconducting phases with complex order parameters in cuprate grain boundary junctions

2001-05-20

arxiv.org/abs/cond-mat/0105388v1

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevLett.88.047001

We propose and implement a direct experimental test for subdominant superconducting phases with broken time-reversal symmetry in d-wave superconductors. The critical current of 45-degree asymmetric grain boundary junctions are shown to be extremely sensitive to the predicted onset of a complex order parameter at (110)-surfaces and near magnetic impurities. Measurements in YBCO and Ni-doped YBCO junctions indicate that the symmetry at the surface is consistent with pure d-wave at all temperatures, putting limits on the magnitude and chiral domain structure of any subdominant symmetry component.

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