Physics – Condensed Matter – Superconductivity
Scientific paper
2007-09-09
Phys. Rev. Lett. 100, 177001 (2008)
Physics
Condensed Matter
Superconductivity
4 pages, 4 figures; Phys. Rev. Lett., published version
Scientific paper
10.1103/PhysRevLett.100.177001
Differential conductance spectra are obtained from nanoscale junctions on the heavy-fermion superconductor CeCoIn$_5$ 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 reflection-like conductance with 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 $d_{x^2-y^2}$ 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.
Greene Laura H.
Park Kyoung Wan
Sarrao John L.
Thompson Daniel J.
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