Point-contact spectroscopy in heavy-fermion superconductors

Details Point-contact spectroscopy in heavy-fermion superconductors Point-contact spectroscopy in heavy-fermion superconductors

2010-04-12

arxiv.org/abs/1004.1882v2

Physical Review B 82 014527 (2010) (12 pages)

Physics

Condensed Matter

Superconductivity

13 pages, 9 figures. Accepted for publication in Physical Review B

Scientific paper

10.1103/PhysRevB.82.014527

We develop a minimal model to calculate point-contact spectra between a metallic tip and a superconducting heavy-fermion system. We apply our tunneling model to the heavy fermion CeCoIn5, 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. We argue that both features may be explained in terms of a multichannel tunneling model in the presence of localized states near the interface. We find that it is not sufficient to tunnel into two itinerant bands of light and heavy electrons to explain the Fano line shape of the differential conductance. Localized states in the bulk or near the interface are an essential component for quantum interference to occur when an electron tunnels from the metallic tip of the point contact into the heavy-fermion system.

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