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Abstract
We report on unusual behaviour of the low-temperature electrical resistivity p of non-equilibrium substitutional solid solutions Al1-x, Six. This behaviour is thought to be comparable with anomalies of d2Il dV2 changes observed under disordering in the tunneling or point-contact spectra of metals, and which results from strong electron-phonon interactions. The resistivity data, along with low temperature heat capacity measurements and Al LII-III X-ray emission spectroscopy (XES) and NMR Knight shift experiments, strongly suggest that an enhancement of the electron-phonon interactions due to lattice instabilities is the main reason for the dramatic increase in the superconducting transition temperature Tc to ∼ 11 K in Al1-xSix when x = 0.2.
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