2004/09/30 by P. M. C. Rourke, M. A. Tanatar, C. S. Turel +4 · 6 citations
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Rare-earth and actinide compounds #Superconductivity in MgB2 and Alloys #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.94.107005
published as Phys. Rev. Lett. 94, 107005 (2005) · 4 pages, 3 figures
openalex publication_date 2005/03/16 · arxiv created 2005/04/10 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Point-contact spectroscopy was performed on single crystals of the heavy-fermion superconductor CeCoIn5 between 150 mK and 2.5 K. A pulsed measurement technique ensured minimal Joule heating over a wide voltage range. The spectra show Andreev-reflection characteristics with multiple structures which depend on junction impedance. Spectral analysis using the generalized Blonder-Tinkham-Klapwijk formalism for d-wave pairing revealed two coexisting order parameter components with amplitudes \ensuremathΔ1=0.95\ifmmode±\else\textpm\fi0.15 meV and \ensuremathΔ2=2.4\ifmmode±\else\textpm\fi0.3 meV, which evolve differently with temperature. Our observations indicate a highly unconventional pairing mechanism, possibly involving multiple bands.