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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 inall samples with $T_c's$ down to 22 K. The evolution of two gaps as a functionof the critical temperature in the doped systems suggest the dominance of theband-filling effects but for the increased Al-doping the enhanced interbandscattering approaching two gaps must be considered. The magnetic fielddependences of the Andreev reflection excess currents as well as zero-energydensity of states determined from the experimental data are used to analyze theintraband scattering. It is shown, that while the C-doping increases theintraband scattering in the $\pi$-band more rapidly then in the $\sigma$ band,the Al-doping does not change their relative weight.Comment: 8 pages, incl. 6 figure

physical review. b, condensed matter and materials physics

Point-contact spectroscopy of Al- and C-doped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Mg</mml:mi><mml:msub><mml:mi mathvariant="normal">B</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>: Superconducting energy gaps and scattering studies

Point-contact spectroscopy of Al- and C-dopedMgB2: Superconducting energy gaps and scattering studies