Evidence for locally correlated spin canting in the reentrant spin-glass state of Au-Fe alloys.

Abstract

We report what we believe to be the first $^{197}\mathrm{Au}$ M\"ossbauer experiments on Au-Fe alloys in the spin-glass and reentrant region (8, 15.7, and 16.8 at.% Fe) in the temperature range 77-4.2 K. The temperature dependence of the mean value ${\overline{B}}_{\mathrm{thf}}$ of the transferred magnetic hyperfine field at the $^{197}\mathrm{Au}$ site in the 16.8-at.%-Fe sample shows the spin-canting transition at ${\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{T}}_{f}$. Analysis of ${\overline{B}}_{\mathrm{thf}}(T)$ gives evidence that this spin canting is not random, but is locally correlated.