Effect of composition disorder on the electron paramagnetic resonance spectrum of the thermally populated excited state of Er3+ ions in YLuAG mixed garnets

摘要

The results of investigation of electron paramagnetic resonance of Er3+ ions in the thermally populated first excited state in (Y1 - x Lu (x) )(3)Al5O12 (YLuAG) mixed yttrium-lutetium garnet single crystals (0 a parts per thousand currency sign x a parts per thousand currency sign 1) are considered. In composition-disordered YLuAG, a number of new (as compared to Y3Al5O12 (YAG)) Er3+ paramagnetic centers are detected; these centers appear due to a change in the crystal field symmetry and magnitude upon isomorphic substitution of Lu3+ for Y3+ in the yttrium sublattice of garnets. The origin of new paramagnetic centers is established and their formation probability is calculated.