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Tunneling limit of heavy-fermion point contacts

Mikael Fogelström (Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik) ; M. J. Graf
International Conference on Strongly Correlated Electron Systems (SCES 2010) (1742-6588). Vol. 273 (2011),
[Konferensbidrag, refereegranskat]

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.



Denna post skapades 2011-06-30.
CPL Pubid: 142730

 

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Institutioner (Chalmers)

Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik

Ämnesområden

Fysik

Chalmers infrastruktur