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

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

Research output: Contribution to journalArticle

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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    Strand, J. D., Bahr, D. J., Van Harlingen, D. J., Davis, J. P., Gannon, W. J., & Halperin, W. P. (2010). The transition between real and complex superconducting order parameter phases in UPT3. Science, 328(5984), 1368-1369. https://doi.org/10.1126/science.1187943