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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
The two-band and/or two-gap superconductivity in aluminum- and carbon-doped $\mathrm{Mg}{\mathrm{B}}_{2}$ has been addressed by the point-contact spectroscopy. Two gaps are preserved in all samples with ${T}_{c}^{\ensuremath{'}}s$ down to $22\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. The evolution of two gaps as a function of the critical temperature in the doped systems suggests the dominance of the …