Phys. Rev. Lett. 103, 197002 (2009) [4 pages]Evidence for Complex Superconducting Order Parameter Symmetry in the Low-Temperature Phase of UPt3 from Josephson InterferometryReceived 30 June 2009; published 4 November 2009 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 π, supporting the E2u representation of the order parameter. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.197002
DOI:
10.1103/PhysRevLett.103.197002
PACS:
74.70.Tx, 74.20.Rp, 74.50.+r
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