LAUSR

The amorphous Co80−xErxB20 alloys with x = 0, 3.9, 5.5 and 8.6% have been prepared by melt spinning in pure argon atmosphere. The electrical resistivity has been measured over the temperature range from 4.2 to 300 K. All investigated amorphous alloys exhibit a logarithmic resistivity versus temperature below the temperature of the resistivity minimum Tmin. In addition, the resistivity shows a quadratic temperature behavior in the temperature range Tmin < T < 77 K. At high temperature, the electrical resistivity was discussed by the extended Ziman theory. For the studied alloys, the composition dependence of the temperature coefficient of electrical resistivity α shows a change in sign related to a structural short-range that is occurring in the composition range 8–9%.