C. - AMORPHOUS METALLIC SYSTEMS.TEMPERATURE DEPENDENCE OF THE ELECTRICAL RESISTIVITY OF AMORPHOUS Ge, Sn AND Bi ALLOYS AND ITS RELATION TO SUPERCONDUCTIVITY

Abstract

The amorphous alloys are quench-condensed from the vapour phase on a substrate at 4 K. The electrical resistivity of amorphous Ge + 41 at. % Au, Bi + 15 at. % Ag and Sn + x at. % Cu (x = 10 to 80) is measured. An unusual linear temperature dependence is found with negative dope for Ge, Bi and Sn alloys and with a positive slope for Sn alloys with Cu concentration less than 60 at. %. The temperature dependent part of the electrical resistivity is explained with conduction electrons being scattered by p-electrons. The superconducting transition temperature of amorphous Sn alloys is found to be proportional to the positive slope of the normal state resistivity