Point-contact spectroscopy of Al- and C-doped MgB2. Superconducting energy gaps and scattering studies

Details Point-contact spectroscopy of Al- and C-doped MgB2. Superconducting energy gaps and scattering studies Point-contact spectroscopy of Al- and C-doped MgB2. Superconducting energy gaps and scattering studies

2006-04-13

arxiv.org/abs/cond-mat/0604342v1

Physics

Condensed Matter

Superconductivity

8 pages, incl. 6 figures

Scientific paper

The two-band/two-gap superconductivity in aluminium and carbon doped MgB$_2$ has been addressed by the point-contact spectroscopy. Two gaps are preserved in all samples with $T_c's$ down to 22 K. The evolution of two gaps as a function of the critical temperature in the doped systems suggest the dominance of the band-filling effects but for the increased Al-doping the enhanced interband scattering approaching two gaps must be considered. The magnetic field dependences of the Andreev reflection excess currents as well as zero-energy density of states determined from the experimental data are used to analyze the intraband scattering. It is shown, that while the C-doping increases the intraband scattering in the $\pi$-band more rapidly then in the $\sigma$ band, the Al-doping does not change their relative weight.

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