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We report 7Li NMR studies of V-substitution effects on spinel oxidesuperconductor LiTi2O4 (Tc = 13.4 K). In LiTi2-xVxO4 (x = 0-0.4), the Vsubstitution for the Ti site suppressed the relative volume fraction ofsuperconductivity faster than Tc. From the observation of fairly homogeneousenhancement in a 7Li nuclear spin-lattice relaxation rate, we conclude that theV substitution changes electron correlation effects through electron carrierdoping from quarter electron filling 3d0.5 to 3d1.5 and then theantiferromagnetic correlation emerges.

Emergence of Antiferromagnetic Correlation in LiTi2-xVxO4 via 7Li NMR