Comment on "Spectroscopic Evidence for Multiple Order Parameter Components in the Heavy Fermion Superconductor CeCoIn${}_5$"

Abstract

Recently, Rourke et al. reported point-contact spectroscopy results on the heavy-fermion superconductor CeCoIn${}_5$ [1]. They obtained conductance spectra on the c-axis surfaces of CeCoIn${}_5$ single crystals. Their major claims are two-fold: CeCoIn${}_5$ has i) d-wave pairing symmetry and ii) two coexisting order parameter components. In this Comment, we show that these claims are not warranted by the data presented. [1] Rourke et al., Phys. Rev. Lett. 94, 107005 (2005).

accepted for publication in Phys. Rev. Lett., final form