REFLECTIVITY OF YIG AND YGG: OBSERVATION OF CHARGE TRANSFER AND CRYSTAL FIELD TRANSITIONS

The reflectivity spectra of yttrium iron garnet (YIG, Y3Fe5O12) and yttrium gallium garnet (YGG, Y3Ga5O12) have been measured in the energy range 2–7.5 eV. Structure is observed in YIG which can be attributed to charge‐transfer‐enhanced crystal field transitions and in YGG to critical point transitions.