Abstract
Motivated by the heavy-fermion Fermi-liquid (HFFL) features observed at low T in the spinel we consider a material-specific model that includes aspects of the local quantum chemistry, the geometrically frustrated lattice structure, and strong correlations in a single approach. In particular, we show how geometrical frustration (GF) gives rise to a crossover scale, the intersite (AF) exchange, below which the metallic system shows HFFL features. Our scenario is a specific realization of the importance of GF effects in driving HFFL behavior in and provides a natural understanding of various puzzling features observed experimentally.
- Received 27 September 2002
DOI:https://doi.org/10.1103/PhysRevB.67.033105
©2003 American Physical Society