Ti-47/49 and La-139 NMR studies on Mott transition in La1-xSrxTiO3

Carrier doping effects on electronic correlations in La1-xSrxTiO3 have been investigated by Ti-47/49 and La-139 NMR The increases of nuclear spin-lattice relaxation rates, (T1T)(-1), of both La and Ti provide the critical enhancements of effective carrier mass on approaching the Mott transition phase boundary from the metallic side. We have no evidences for a prominent increase of antiferromagnetic spin fluctuations at q similar to Q near the Mott-transition boundary, which is sharply contrast to the case of high-T-c cuprates.