Point-contact Andreev reflection spectroscopy of heavy-fermion-metal/superconductor junctions

W. K. Park, H. Stalzer, J. L. Sarrao, J. D. Thompson, L. D. Pham, Z. Fisk, J. Frederick, P. C. Canfield, L. H. Greene

Research output: Contribution to journalArticlepeer-review


Our previous point-contact Andreev reflection studies of the heavy-fermion superconductor CeCoIn5 using Au tips have shown two clear features: reduced Andreev signal and asymmetric background conductance. To explore their physical origins, we have extended our measurements to point-contact junctions between single crystalline heavy-fermion metals and superconducting Nb tips. Differential conductance spectra are taken on junctions with three heavy-fermion metals, CeCoIn5, CeRhIn5, and YbAl3, each with different electron mass. In contrast with Au/CeCoIn5 junctions, Andreev signal is not reduced and no dependence on effective mass is observed. A possible explanation based on a two-fluid picture for heavy fermions is proposed.

Original languageEnglish (US)
Pages (from-to)818-819
Number of pages2
JournalPhysica B: Condensed Matter
Issue number5-9
StatePublished - Apr 1 2008


  • Andreev reflection
  • Blonder-Tinkham-Klapwijk theory
  • Effective mass
  • Heavy fermions

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics


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