FLUORESCENCE AND MAGNETOOPTICS OF ER3+ IN CA3GA2GE3O12 GARNET

We report fluorescence, magneto-optics and light absorption studies of Er3+ in Ca3Ga2Ge3O12 both at room and liquid-helium temperatures. We found that several sites are occupied by the Er3+ ions, which substitu te Ca2+, corresponding with different charge compensation in the Er3neighbourhood. Here we present the complete optical study of the most populated of these sites. We compare our results with previous ESR exp eriments in similar samples and other rare-earth optical experiments i n the same host. (C) 1998 Elsevier Science Ltd. All rights reserved.