Resistive Behavior of DilutePdFeAlloys about the Curie Temperature

Abstract

We have analyzed the behavior of the magnetic part of the electrical resistivity ${\rho }_m$ for four dilute samples of $\mathrm{Pd}\mathrm{Fe}(0.1,0.25,0.50, \mathrm{and} 1.0 \mathrm{at}.\%\mathrm{o}\mathrm{f}\mathrm{F}\mathrm{e})$ in the vicinity of the Curie temperature. The ferromagnetic critical temperature for these samples was determined by the location of the maximum in $\frac{d{\rho }_m}{\mathrm{dT}}$ and was found to vary with concentration as $c^n$, with $n=1.65\mathrm{}\pm 0.05$. The "singularity" of $\frac{d{\rho }_m}{\mathrm{dT}}$ was found to be much stronger than logarithmic with the exponents varying over a wide range of values. Also, we find that particularly in one sample, ${\mathrm{Pd}}_{0.995}{\mathrm{Fe}}_{0.005}$, the long-range nature of the short-range spin fluctuations plays a significant role in determining the behavior of $\frac{d{\rho }_m}{\mathrm{dT}}$.