Andreev Reflection in Heavy-Fermion Superconductors and Order Parameter Symmetry in CeCoIn 5 - Condensed Matter > SuperconductivityReport as inadecuate




Andreev Reflection in Heavy-Fermion Superconductors and Order Parameter Symmetry in CeCoIn 5 - Condensed Matter > Superconductivity - Download this document for free, or read online. Document in PDF available to download.

Abstract: Differential conductance spectra are obtained from nanoscale junctions on theheavy-fermion superconductor CeCoIn$ 5$ along three major crystallographicorientations. Consistency and reproducibility of characteristic features amongthe junctions ensure their spectroscopic nature. All junctions show a similarconductance asymmetry and Andreev reflection-like conductance with reducedsignal ~ 10%-13%, both commonly observed in heavy-fermion superconductorjunctions. Analysis using the extended Blonder-Tinkham-Klapwijk model indicatesthat our data provide the first spectroscopic evidence for $d {x^2-y^2}$symmetry. To quantify our conductance spectra, we propose a model byconsidering the general phenomenology in heavy fermions, the two-fluidbehavior, and an energy-dependent density of states. Our model fits to theexperimental data remarkably well and should invigorate further investigations.



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

Source: https://arxiv.org/







Related documents