The Gd–Ce Cross-Relaxation Effects in ODMR via Ce3+ Emission in Garnet Crystals

Resumo

Electron paramagnetic resonance (EPR) in the ground state of Gd³⁺ ions in (LuGd)₃ Al₅O₁₂ single crystals has been found by monitoring the Ce³⁺ photoluminescence intensity under circularly polarized excitation in the presence of the 35 GHz microwave field. Due to spin selection rules for optical transitions, the circularly polarized excitation allowed monitoring the populations of the Ce³⁺ ground-state spin sublevels, which can be changed at the EPR of Gd³⁺ due to Gd–Ce cross relaxation.