Covalent bonding and <italic>J</italic>–<italic>J</italic> mixing effects on the EPR parameters of Er<sup>3 +</sup> ions in GaN crystal

Covalent bonding and J–J mixing effects on the EPR parameters of Er^{3 +} ions in GaN crystal

Chai Rui-Peng^†,, Li Long, Liang Liang, Pang Qing

Local structure of hexagonal (GaN₄)⁹⁻ cluster in the GaN crystal. The central cation Ga³⁺ is replaced by the Er³⁺ ion with approximate C_3v symmetry when Er³⁺ is embedded in GaN host.