Scanning Tunneling Spectroscopy on the novel superconductor CaC6

Details Scanning Tunneling Spectroscopy on the novel superconductor CaC6 Scanning Tunneling Spectroscopy on the novel superconductor CaC6

2006-04-07

arxiv.org/abs/cond-mat/0604208v1

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevLett.97.077003

We present scanning tunneling microscopy and spectroscopy of the newly discovered superconductor CaC$_6$. The tunneling conductance spectra, measured between 3 K and 15 K, show a clear superconducting gap in the quasiparticle density of states. The gap function extracted from the spectra is in good agreement with the conventional BCS theory with $\Delta(0)$ = 1.6 $\pm$ 0.2 meV. The possibility of gap anisotropy and two-gap superconductivity is also discussed. In a magnetic field, direct imaging of the vortices allows to deduce a coherence length in the ab plane $\xi_{ab}\simeq$ 33 nm.

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