Theoretical study of the hyperfine field at Cu impurities diluted in an iron host

Abstract

Magnetic hyperfine field at Cu isotopes as impurities in Fe were recently measured at low temperature. A model to explain these experimental results is proposed. The diluted Cu impurities in the ferromagnetic Fe host are described by an extension of the Daniel-Friedel model, including the next neighbor perturbation. In order to account for the available experimental data in Cu isotopes with atomic masses $A$ $=$ 59, 67, 69, and 71 as impurity, we needed to incorporate the Cu anomaly volume in the effective charge to be screened and self-consistent procedures.