Anisotropic Behavior of Dilute Au:Dy Alloys: Observation of theΓ8(Quartet) Resonance

Abstract

We report the first observation of a ${\Gamma }_8$ (quartet) resonance in a metal (Au:Dy). The field for resonance determines the relative magnitude and sign of the crystal-field parameters, $\frac{B_4}{B_6}=1300\mathrm{}\pm 30$, to be compared with that found for Ag:Dy alloys, ≤340. The linewidth yields an exchange-coupling parameter $J_{\mathrm{fs}}=0.14\mathrm{}\pm 0.05$ eV, slightly larger than for Au:Gd and Au:Er alloys, and slightly smaller than for silver-based alloys.