Abstract
The temperature dependence of the electrical resistivity of amorphous (Fe1−xCox)78Si9.5B12.5 (0⩽×⩽1.0) alloys prepared by a single roller quenching apparatus was studied. The electrical resistivity of the samples was measured by using a usual four-probe method from 4.2 to 300 K. All amorphous alloys investigated here are found to exhibit a resistivity minimum at low temperature. The temperature of resistivity minimum Tmin is found first to increase and then to decrease with increasing Co content x, having a maximum value of 33.5 K at x=0.9. The electrical resistivity exhibits a logarithmic temperature dependence at T<Tmin, and a T2 dependence in the interval Tmin<T<130 K. The resistivity minimum and the −ln T dependence of resistivity below Tmin can be explained by the Kondo-like effect. The temperature dependence of the electrical resistivity above Tmin was discussed by the extended Ziman theory. The Debye temperature θD calculated from the temperature coefficient of electrical resistivity above Tmin is found to be 450±70 K.
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