Eu³⁺ superhyperfine structure due to magnetic dipoledipole 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 ⁷7₀→⁵⁺D₀ transition of Eu ³⁺. The structure is attributed to magnetic dipoledipole 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.