Crystal growth and optical properties of Co~(2+) doped SrLaGa_3O_7

摘要

Cobalt doped SrLaGa_3O_7 single crystals have been grown by the Czochralski method in a nitrogen atmosphere and by a floating zone method with optical heating in air. Starting concentrations of Co in the melt were: 0.15, 0.3, 2 and 3 mol.% with respect to Ga by the Czochralski method whereas 2 and 4 mol.% by the floating zone method. We have presented absorption spectra as well as EPR spectra related to octahedrally coordinated Co~(2+) ion in SrLaGa_3O_7. It show EPR spectra with a spin of S = 1/2, G_‖ = 2.26 ± 0.04, g_⊥ = 4.7 ± 0.2 and tree different octahedral positions in SLGO lattice.