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• W2018047404 startingPage "2845" @default.
• W2018047404 abstract "Measurements are presented of the electrical resistivity for a series of Au Fe alloys with concentrations between 0.5- and 22-at.% Fe, in the temperature range 0.5 - 300 K. We have called the concentration range between about 0.5- and 8-at.% Fe, the spin-glass regime. Here we find that the impurity resistivity $ensuremath{Delta}ensuremath{rho}$ has a ${T}^{frac{3}{2}}$ dependence down to the lowest temperatures of measurement, the coefficient of this dependence decreasing very slowly with concentration. At higher temperatures, around the freezing temperature ${T}_{0}$ the impurity resistivity is increasing linearly with temperature, and this is followed, at much larger temperatures, by a very broad resistance maximum. We have called the concentration range above ensuremath{cong}10-at.% Fe, the mictomagnetic regime which is characterized by having large magnetic clusters and a sensitivity to thermal and magnetic history. Upon further increasing the concentration to the percolation limit $censuremath{gtrsim}15$ at.%, such that there is sufficient overlapping among these magnetic clusters, Au Fe gradually develops a long-range inhomogeneous ferromagnetic regime. Again we observe a ${T}^{frac{3}{2}}$ temperature dependence throughout both of these regimes at low temperatures, but at higher temperatures the deviation away from this dependence is much more complicated than in the spin-glass regime. Further, the onset of magnetic ordering is clearly seen in $ensuremath{Delta}ensuremath{rho}$. We have also examined the temperature dependence of the derivative of the impurity resistivity $frac{d(ensuremath{Delta}ensuremath{rho})}{mathrm{dT}}$, and find that throughout our whole concentration range there is a well-defined maximum which correlates fairly well with ${T}_{0}$. The experimental and theoretical background of these measurements is fully discussed." @default.
• W2018047404 created "2016-06-24" @default.
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• W2018047404 date "1974-10-01" @default.
• W2018047404 modified "2023-09-24" @default.
• W2018047404 title "Electrical resistivity of<i>Au</i>Fe alloys in the spin-glass, mictomagnetic, and ferromagnetic regimes" @default.
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• W2018047404 doi "https://doi.org/10.1103/physrevb.10.2845" @default.
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