Perturbed Angular Correlation Measurement onRh100in a Ni Host: Critical Exponentβfor Ni

Abstract

We have measured the hyperfine field at ${}_{}{}^{100}{}_{}{}^{}\mathrm{Rh}$ impurity nuclei in a ferromagnetic Ni host in the region just below the Curie temperature, using time-differential perturbed $\gamma \gamma$ angular correlations. We obtain a single-valued critical exponent of $\beta =0.385\mathrm{}\pm 0.005$.