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

Abstract

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.

4 pages, 4 figures; Phys. Rev. Lett., published version

References in corpus (13)

• Angular Position of Nodes in the Superconducting Gap of Quasi-2D Heavy-Fermion Superconductor CeCoIn_5
• Field-angle Dependence of the Zero-Energy Density of States in the Unconventional Heavy-Fermion Superconductor CeCoIn5
• Scaling in the Emergent Behavior of Heavy Electron Materials
• Unpaired Electrons in the Heavy-Fermion Superconductor CeCoIn_{5}
• Universal Behavior in Heavy Electron Materials
• Nodal structure of quasi-2D superconductors probed by magnetic field
• Anomalous quasiparticle transport in the superconducting state of CeCoIn5
• Point-Contact Spectroscopy of the Heavy-Fermion Superconductor CeCoIn${}_5$
• Magnetism and unconventional superconductivity in Ce${}_n$M${}_m$In${}_{3n+2m}$ heavy-fermion crystals
• Construction of a Cantilever-Andreev-Tunneling rig and its applications to superconductors
• Comment on "Spectroscopic Evidence for Multiple Order Parameter Components in the Heavy Fermion Superconductor CeCoIn${}_5$"
• Andreev reflection spectroscopy of the heavy-fermion superconductor CeCoIn${}_5$ along three different crystallographic orientations
• Point-contact Andreev reflection spectroscopy of heavy-fermion-metal/superconductor junctions

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