be AI 41-111 x-my emission specha galvanmagnetic pmperties and superconductive-stale parameters were investigated in sugersaturared Ali-ISix FCC solid solutions oblained by a high-pressure m e n l (P 5 8.0 GPa). A draslic denease in the charge d e r mobility and an anomalous behaviour of the hole mncenMion were found. The previous model which was used 10 desvribe lh superconduning Propenies of A l S i is reviewed. Anomalous galvanomagnetic progenies and enhancement of the value of the superconducting remperarure & are asumed 10 be connected with the local 'sofl regions' in the vicinity of the lanice instability.

We report unusual behavior of the low-temperature electrical resistivity p of nonequilibrium substitutional solid solutions of the form Al& "Si . This behavior is thought to be similar to anomalies in d I/d V observed in the tunneling or point-contact spectra of metals in the presence of disorder, and to result from strong electron-phonon interactions. The resistivity data, along with low-temperature heatcapacity measurements and Al L»»I x-ray-emission spectroscopy 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 T, to -11 K in Al& Si when x =0.2.

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