The transition between real and complex superconducting order parameter phases in UPT3

J. D. Strand, D. J. Bahr, D. J. Van Harlingen, J. P. Davis, W. J. Gannon, W. P. Halperin

Research output: Contribution to journalArticlepeer-review

50 Scopus citations

Abstract

Order parameter symmetry is one of the basic characteristics of a superconductor. The heavy fermion compound URt3 provides a rich system for studying the competition between superconductivity and other forms of electronic order and exhibits two distinct superconducting phases that are characterized by different symmetries. We fabricated a series of Josephson tunnel junctions on the as-grown surfaces of UPt3 single crystals spanning the a-b plane. By measuring their critical current, we mapped out the magnitude of the superconducting order parameter as a function of the momentum-space direction and temperature. In the high-temperature phase, we observed a sharp node in the superconducting gap at 45° with respect to the a axis; an out-of-phase component appeared in the low-temperature phase, creating a complex order parameter.

Original languageEnglish (US)
Pages (from-to)1368-1369
Number of pages2
JournalScience
Volume328
Issue number5984
DOIs
StatePublished - Jun 11 2010

ASJC Scopus subject areas

  • General

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