  Above 40K, the magnetic susceptibility of the heavy Fermion spinel LiV2O4 has
many features in common with those of geometrically frustrated magnetic
insulators, while its room temperature resistivity comfortably exceeds the
Mott-Regel limit. This suggests that local magnetic moments, and the underlying
geometry of the pyrochlore lattice, play an important role in determining its
magnetic properties. We extend a recently introduced tetragonal mean field
theory for insulating pyrochlore antiferromagnets to the case where individual
tetrahedra contain spins of different lengths, and use this as a starting point
to discuss three different scenarios for magnetic and electronic transitions in
LiV2O4.
