Logarithmic Temperature Dependence of Electrical Resistivity of (Co41Fe39B20)x(Al–O)100 – x Nanocompositesстатья
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Дата последнего поиска статьи во внешних источниках: 17 ноября 2016 г.
Аннотация:The temperature dependence of the conductivity σ(T) of (Co41Fe39B20)x(Al–O)100 – x nanocomposite films for different concentrations of amorphous ferromagnetic metal, x (56 > x > 30), is studied in the temperature range of 4.2–300 K. It is shown that, for the concentrations in the interval 56 > x > 49, the conductivity obeys the logarithmic law σ(T) = A(1 + αlnT), where A and α depend on the concentration. According to the theory developed by Efetov et al, this logarithmic dependence is connected with specificities of the
Coulomb interaction in nanogranulated alloys on the intergranule tunneling in the transient region of concentrations from metallic conduction to the dielectric regime. The comparison of the theory with the experiment revealed only qualitative agreement. The reasons of the quantitative disagreement are discussed. The resistivity of samples with the concentrations lying in the range 49 > x > 30 obeys the 1/2 power law.