LiV2O4: evidence for two-stage screening

LiV2O4, a frustrated mixed valent metal (d 1 ↔ d2), is argued to undergo two spinscreening processes. The first quenches the effective spin to produce the spin 1 2 behavior seen below room temperature[1] , while the second produces the heavy fermi liquid character seen at low temperatures[2]. We present here a preliminary discussion of a t-J model with strong Hund’s coupling of the strongly correlated d-electrons. Valence fluctuations of the Hubbard operators (S = 1 2 ↔ 1) combined with the frustration of the underlying corner-shared tetrahedral vanadium lattice are the essential components of our model.