Mixed valence on a pyrochlore lattice - LiV2O4 as a geometrically frustrated magnet

Details Mixed valence on a pyrochlore lattice - LiV2O4 as a geometrically frustrated magnet Mixed valence on a pyrochlore lattice - LiV2O4 as a geometrically frustrated magnet

2002-03-09

arxiv.org/abs/cond-mat/0203209v1

Eur. Phys. J. B 27, 527-540 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

15 pages latex, 12 eps figures, uses EPJ macros

Scientific paper

10.1140/epjb/e2002-00186-9

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.

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