Temperature dependence of the magnetic hyperfine field at an s-p impurity diluted in $R$Ni$_{2}$

A. L. de Oliveira; C. M. Chaves; N. A. de Oliveira; A. Troper

doi:10.1016/j.jmmm.2015.10.057

paper

Temperature dependence of the magnetic hyperfine field at an s-p impurity diluted in $R$ Ni $_{2}$

arXiv:1508.05969 · doi:10.1016/j.jmmm.2015.10.057

Abstract

We study the formation of local magnetic moments and magnetic hyperfine fields at an \textit{s-p} impurity diluted in intermetallic Laves phases compounds $R$ Ni $_{2}$ ( $R$ = Nd, Sm, Gd, Tb, Dy) at finite temperatures. We start with a clean host and later the impurity is introduced. The host has two-coupled ( $R$ and Ni) sublattice Hubbard Hamiltonians but the Ni sublattice can be disregarded because its $d$ band, being full, is magnetically ineffective. Also, the effect of the $4f$ electrons of $R$ is represented by a polarization of the \textit{d} band that would be produced by the $4f$ magnetic field.This leaves us with a lattice of \textit{effective} rare earth \textit{R}-ions with only \textit{d} electrons. For the \textit{dd} electronic interaction we use the Hubbard-Stratonovich identity in a functional integral approach in the static saddle point approximation.

4 pages , 3 figures

Temperature dependence of the magnetic hyperfine field at an s-p impurity diluted in RNi2​

Abstract

Temperature dependence of the magnetic hyperfine field at an s-p impurity diluted in $R$ Ni $_{2}$