Measurement of the Josephson effect of heavy-fermion superconductor UPt 3 as a test of the odd-parity order parameter

Jun Gouchi, Akihiko Sumiyama, Gaku Motoyama, Akira Yamaguchi, Noriaki Kimura, Etsuji Yamamoto, Yoshinori Haga, Yoshichika Onuki

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

The Josephson critical current I c between a single-crystal UPt3 and Al has been measured for the junctions on the UPt3 surface perpendicular to the hexagonal a[1120], b[1010], and c[0001] axes. The magnetic field dependence of I c shows a Fraunhofer diffraction pattern for a current flow parallel to the c-axis, suggesting that the Josephson coupling is uniform throughout the junction. Small modifications applied to the Fraunhofer pattern have been observed for a current flow parallel to the a- and b-axes. These results contradict the E 2u scenario for the odd-parity order parameter in UPt 3, in which the Josephson effect is forbidden in the three directions, whereas the recently proposed E1 u scenario permits, at least, the a- and c-axis Josephson couplings.

Original languageEnglish
Article number113701
Journaljournal of the physical society of japan
Volume81
Issue number11
DOIs
Publication statusPublished - 2012 Nov

Keywords

  • Heavy-fermion superconductor
  • Josephson effect
  • UPt

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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