Evidence for gap anisotropy in CaC6 from directional point-contact spectroscopy

Details Evidence for gap anisotropy in CaC6 from directional point-contact spectroscopy Evidence for gap anisotropy in CaC6 from directional point-contact spectroscopy

2007-08-07

arxiv.org/abs/0708.0921v2

Phys. Rev. Lett. 100, 207004 (2008)

Physics

Condensed Matter

Superconductivity

4 pages, 4 color eps figures. New results at 400 mK added; figures and discussion modified accordingly. Phys. Rev. Lett., acce

Scientific paper

10.1103/PhysRevLett.100.207004

We present the first results of directional point-contact spectroscopy in high quality CaC6 samples both along the ab plane and in the c-axis direction. The superconducting order parameter \Delta(0), obtained by fitting the Andreev-reflection (AR) conductance curves at temperatures down to 400 mK with the single-band 3D Blonder-Tinkham-Klapwijk model, presents two different distributions in the two directions of the main current injection, peaked at 1.35 and 1.71 meV, respectively. By ab-initio calculations of the AR conductance spectra, we show that the experimental results are in good agreement with the recent predictions of gap anisotropy in CaC6.

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