Nonuniqueness of Freezing Temperature of Spins in Binary Alloys

Abstract

Small-angle neutron scattering measurements on $\mathrm{Au}\mathrm{Fe}$ alloys containing 10 and 13 at.% Fe are reported. These show a series of $q$-dependent freezing temperatures [sharp discontinuities in the forward scattering intensity $I\left(q\right)\mathrm{}$ as a function of $T$] in contrast to a unique freezing temperature (sharp cusp) observed in the low-field magnetic susceptibility of the alloys.