UNIVERSAL COLLECTIVE EFFECT IN THE LOW-TEMPERATURE RESISTIVITY OF CONCENTRATED AMORPHOUS SPIN-GLASSES

The linear upturn of the electrical resistivity, DELTArho = -C1T, first reported below the freezing temperature T(f) of Fe2.4Ni77.6Si8B12, is shown to be a rather universal feature of metallic glasses containing localized 3d and 4f moments in a wide range of concentrations. The normalized amplitudes, C1T(f), are almost independent of composition and the magnetoresistance also indicates that impurity scattering of the conduction electrons is not effective below T(f). We discuss these results by assuming that the spin-glass order parameter q approximately (1 - T/T(f)) increases the resistivity structure factor of the amorphous matrix.