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

Abstract

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
Volume100
Issue number17
DOIs
StatePublished - Apr 28 2008

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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