Temperature and magnetic field dependences of the resistivity of amorphous alloys

Abstract

High-resolution resistivity measurements on a wise variety of amorphous alloys are reported for the temperature range from 0.5K to room temperature in magnetic fields up to 45 kOe. The resistivities are large. At the lower temperatures, below 20K, the resistivity is dominated by a -In(T²+ Delta ²) term with Delta approximately 0.5K. This term is unaffected by magnetic fields ruling out magnetic scattering in favour of scattering from the disordered structure. Successive thermal annealing of selected samples has no effect on the resistivity until the onset of crystallisation, after which the residual resistivity decreases and the low-temperature anomaly all but disappears.