부산대학교 도서관

Our investigation of the electrical resistivity ρ(T) betweenT=0.1 K and 295 K revealed for all Fe-concentrations, 2.4≤x≤16, a minimum of ρ betweenTmin=7 K and 15 K. Above the minimum, scattering from structural disorder prevails in the paramagnetic alloy (x=2.4), while in the ferromagnetic glasses (x≥5.6) coherent magnon scattering appears to dominate. With one exception, ρ(T≤Tmin) increases as$$\sqrt T $$ slopes, 6.3(6) (Ω cm)−1 K−1/2, agrees with the universal scaling behaviour reported recently by Cochrane and Strom-Olsen for systems with strong electron-electron interaction. A large, linear rise of ρ(Tmin,B=0) observed in the most diluted sample (x=2.4) is tentatively attributed to quantum localization in the non-reentrant spin glass phase. The magnitude of the temperature effects on ρ(T) above as well as belowTmin indicates significantd-band contributions to the conductivity.