Observation of the Josephson effect in the heavy-fermion superconductor CeIrIn5 above Tc

A. Sumiyama, D. Katayama, Y. Oda, Y. Inada, D. Aoki, Y. Tokiwa, Y. Haga, Y. Onuki

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8 Citations (Scopus)


The Josephson effect for a heavy-fermion superconductor CeIrIn5, which has two characteristic temperatures T0 and Tc, has been investigated for CeIrIn5-Cu-Nb junctions, where T0 and Tc are the temperature of the transition to the zero-resistivity state and the bulk, thermodynamic transition temperature, respectively. For all the junctions fabricated on the (110) and (001) planes of CeIrIn5, the temperature below which the Josephson effect is observed is near T0 = 0.8 K and much higher than Tc = 0.3 K. This result suggests that at least the surface of CeIrIn5 is in a superconducting state below T0, in which phase coherence between CeIrIn5 and Nb is possible.

Original languageEnglish
Pages (from-to)L879-L884
JournalJournal of Physics Condensed Matter
Issue number42
Publication statusPublished - Oct 22 2001
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics


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