Eu3+ superhyperfine structure due to magnetic dipole-dipole interactions with Nd3+ in Nd3+:EuCl3·6H2O

We report the observation of structure on the ground state hyperfine levels of Eu3+ in Nd3+:EuCl3·6H2O using Raman heterodyne detected nuclear magnetic resonance. The strength of the interaction varied for different satellite lines in the spectrum of the F07→D05 transition of Eu3+. The structure is attributed to magnetic dipole-dipole interactions with Nd3+, and it is proposed that these interactions can be used to associate the satellite lines with the positions of the Eu3+ ions relative to the Nd3+ ion. We discuss the implications of these measurements for quantum computing applications of stoichiometric crystals.