Hyperfine Field and Hyperfine Anomalies of Copper Impurities in Iron

TL;DR

This paper precisely measures the hyperfine magnetic field of copper impurities in iron using combined experimental techniques, confirming previous values with higher accuracy and analyzing hyperfine anomalies across isotopes.

Contribution

It provides a more precise value for the hyperfine magnetic field of copper in iron and compares hyperfine anomalies among isotopes, supported by experimental and theoretical data.

Findings

Hyperfine magnetic field Bhf(CuFe) = -21.794(10) T.

Hyperfine anomalies: 59Δ69=0.15(9)% and 71Δ69=0.07(11)%.

Abstract

A new value for the hyperfine magnetic field of copper impurities in iron is obtained by combining resonance frequencies from experiments involving {\beta}-NMR on oriented nuclei on 59-Cu, 69-Cu, and 71-Cu with magnetic moment values from collinear laser spectroscopy measurements on these isotopes. The resulting value, i.e., Bhf(CuFe) = -21.794(10) T, is in agreement with the value adopted until now but is an order of magnitude more precise. It is consistent with predictions from ab initio calculations. Comparing the hyperfine field values obtained for the individual isotopes, the hyperfine anomalies in Fe were determined to be 59{\Delta}69=0.15(9)% and 71{\Delta}69=0.07(11)%.