Andreev reflection in heavy-fermion superconductors and order parameter symmetry in CeCoIn5

W. K. Park, J. L. Sarrao, J. D. Thompson, L. H. Greene

Research output: Contribution to journalArticlepeer-review


Differential conductance spectra are obtained from nanoscale junctions on the heavy-fermion superconductor CeCoIn5 along three major crystallographic orientations. Consistency and reproducibility of characteristic features among the junctions ensure their spectroscopic nature. All junctions show a similar conductance asymmetry and Andreev reflectionlike conductance with a reduced signal (∼10%-13%), both commonly observed in heavy-fermion superconductor junctions. Analysis using the extended Blonder-Tinkham-Klapwijk model indicates that our data provide the first spectroscopic evidence for dx2-y2 symmetry. To quantify our conductance spectra, we propose a model by considering the general phenomenology in heavy fermions, the two-fluid behavior, and an energy-dependent density of states. Our model fits to the experimental data remarkably well and should invigorate further investigations.

Original languageEnglish (US)
Article number177001
JournalPhysical review letters
Issue number17
StatePublished - Apr 28 2008

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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