Evidence for complex superconducting order parameter symmetry in the low-temperature phase of UPt3 from Josephson interferometry

We present data on the modulation of the critical current with applied magnetic field in UPt3-Cu-Pb Josephson junctions and SQUIDs. The junctions were fabricated on polished surfaces of UPt3 single crystals. The shape of the resulting diffraction patterns provides phase-sensitive information on the...

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Bibliographic Details
Published in:Physical review letters 2009-11, Vol.103 (19), p.197002-197002
Main Authors: Strand, J D, Van Harlingen, D J, Kycia, J B, Halperin, W P
Format: Article
Language:English
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Summary:We present data on the modulation of the critical current with applied magnetic field in UPt3-Cu-Pb Josephson junctions and SQUIDs. The junctions were fabricated on polished surfaces of UPt3 single crystals. The shape of the resulting diffraction patterns provides phase-sensitive information on the superconducting order parameter. Our corner junction data show asymmetric patterns with respect to magnetic field, indicating a complex order parameter, and both our junction and SQUID measurements point to a phase shift of pi, supporting the E(2u) representation of the order parameter.
ISSN:1079-7114
DOI:10.1103/PhysRevLett.103.197002