Electrical resistivity of Au Fe alloys in the spin-glass, mictomagnetic, and ferromagnetic regimes

摘要: Measurements are presented of the electrical resistivity for a series Au Fe alloys with concentrations between 0.5- and 22-at.% Fe, in temperature range 0.5 - 300 K. We have called concentration about 8-at.% spin-glass regime. Here we find that impurity $\ensuremath{\Delta}\ensuremath{\rho}$ has ${T}^{\frac{3}{2}}$ dependence down to lowest temperatures measurement, coefficient this decreasing very slowly concentration. At higher temperatures, around "freezing" ${T}_{0}$ is increasing linearly temperature, followed, at much larger by broad resistance maximum. above \ensuremath{\cong}10-at.% mictomagnetic regime which characterized having large magnetic clusters sensitivity thermal history. Upon further percolation limit $c\ensuremath{\gtrsim}15$ at.%, such there sufficient overlapping among these clusters, gradually develops long-range inhomogeneous ferromagnetic Again observe throughout both regimes low but deviation away from more complicated than Further, onset ordering clearly seen $\ensuremath{\Delta}\ensuremath{\rho}$. also examined derivative $\frac{d(\ensuremath{\Delta}\ensuremath{\rho})}{\mathrm{dT}}$, our whole well-defined maximum correlates fairly well ${T}_{0}$. The experimental theoretical background measurements fully discussed.