Tunneling limit of heavy-fermion point contacts

Details Tunneling limit of heavy-fermion point contacts Tunneling limit of heavy-fermion point contacts

2010-09-15

arxiv.org/abs/1009.3054v1

Journal of Physics: Conference Series 273 (2011) 012073 (6 pages)

Physics

Condensed Matter

Superconductivity

Contribution at SCES-2010

Scientific paper

10.1088/1742-6596/273/1/012073

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.

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