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Comment: 4 pages, compressed encoded postscript (using "uufiles"). Submitted to PRB (Rap. Comm.)
We present results for a multichannel tunneling model that describes point-contact spectra between a metallic tip and a superconducting heavy-fermion system. We calculate tunneling spectra both in the normal and superconducting state. In point-contact and scanning tunneling spectroscopy many heavy-fermion materials, like CeCoIn5, exhibit an asymmetric differential conductance, dI/dV, combined with a strongly suppressed Andreev reflection signal in the superconducting state. For Andreev reflection to occur a junction has to be in the highly transparent limit. Here we focus on the opposite limit, namely that of low transparency leading to BCS-like dI/dV curves. We discuss the consequences of a multichannel tunneling model for CeCoIn5 assuming itinerant electron bands and localized f electrons.
Comment: 19 pages total, 4 figures; accepted for publication in Phys. Rev. B
Comment: 7 pages, 5 figures; updated list of references and extended introduction; to appear in Phys. Rev. B (Oct. 2000)
Comment: 13 pages, 8 figures. Accepted by Phys. Rev. B
Comment: 9 pages, 4 figures, presented at QFS2009
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