Andreev Reflection in Heavy-Fermion Superconductors and Order Parameter Symmetry in CeCoIn_5

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dc.creatorPark, W. K.
dc.creatorSarrao, J. L.
dc.creatorThompson, J. D.
dc.creatorGreene, L. H.
dc.date2007-09-09
dc.date2008-04-28
dc.date.accessioned2026-07-07T09:35:11Z
dc.date.available2026-07-07T09:35:11Z
dc.descriptionDifferential 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.
dc.description4 pages, 4 figures; Phys. Rev. Lett., published version
dc.identifierhttps://arxiv.org/abs/0709.1246
dc.identifierhttp://arxiv.org/abs/0709.1246
dc.identifierPhys. Rev. Lett. 100, 177001 (2008)
dc.identifierdoi:10.1103/PhysRevLett.100.177001
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/159751
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleAndreev Reflection in Heavy-Fermion Superconductors and Order Parameter Symmetry in CeCoIn_5
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