NMR-STUDY ON ELECTRONIC AND MAGNETIC STATE IN RTIO(3) (R=LA,Y)

The electronic and magnetic states in perovskite titanates, RTiO(3) ha ve been investigated microscopically by NMR. In the ferromagnetically- ordered state of YTiO3, (T-c=25K) there exist two magnetically-inequiv alent Ti sites with slightly different internal fields, H-int, corresp onding to the reduced Ti moments of 0.69 and 0.76 mu(B). H-int of Y-89 is -10.3 kOe in YTiO3, while H-int at the La-139 sire is canceled out in the antiferromagnetic LaTiO3. Nuclear spin-lattice relaxation time , TI, of Y-89 increase drastically with decreasing temperature below s imilar to 60K where the ferromagnetic alignment of Ti moments induced by external filed seems to grow up. T-1 of La-139 in Sr-doped LaTiO3 o beys the Korringa relation, T1T=const. of which value increases critic ally on approaching the Mott insulator-metal transition.