Emergence of Antiferromagnetic Correlation in LiTi2-xVxO4 via 7Li NMR
We report 7 Li NMR studies of V-substitution effects on the spinel oxide superconductor LiTi 2 O 4 ( T c =13.4 K). In LiTi 2- x V x O 4 ( x =0–0.4), the V substitution for the Ti site suppressed the relative volume fraction of superconductivity faster than T c . From the observation of a fairly homogeneous increase in 7 Li nuclear spin–lattice relaxation rate, we conclude that the V substitution changes electron correlation effects through electron carrier doping from quarter electron filling 3 d 0.5 to 3 d 1.5 and then the antiferromagnetic correlation emerges.