LiV2O4, a frustrated mixed valent metal (d^1 <-> d^2), is argued to undergo two spin-screening 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.
@article{arxiv.cond-mat/0110115,
title = {LiV2O4: evidence for two-stage screening},
author = {J. Hopkinson and P. Coleman},
journal= {arXiv preprint arXiv:cond-mat/0110115},
year = {2009}
}
Comments
5 pages, 1 figure, accepted for proceedings of SCES'2001 Physica B, minor changes