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

TL;DR

This study uses 7Li NMR to investigate how V substitution affects electron correlations and induces antiferromagnetic correlations in LiTi2O4, a spinel oxide superconductor, revealing doping-driven magnetic behavior.

Contribution

It demonstrates that V substitution alters electron correlations and promotes antiferromagnetic correlations in LiTi2O4, a novel insight into doping effects in this superconductor.

Findings

V substitution suppresses superconductivity faster than Tc.

Antiferromagnetic correlations emerge with V doping.

Electron doping changes the electron correlation effects.

Abstract

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