title: Correlation-driven heavy-fermion formation in LiV2O4.
abstract: Optical reflectivity measurements were performed on a single crystal of the d-electron heavy-fermion (HF) metal LiV2O4. Our results evidence the highly incoherent charge dynamics above T* approximately 20 K and the redistribution of the spectral weight of the optical conductivity over broad energy scales ( approximately 5 eV) as the quantum coherence of the charge carriers is recovered. This reveals that LiV2O4 is close to a correlation-driven insulating state and indicates that, in sharp contrast to f-electron HF Kondo-lattice systems, strong electronic correlation effects dominate the heavy quasiparticle formation in LiV2O4.
authors.affiliation: RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: P E
authors.initials: PE
authors.lastname: Jönsson
authors.forename: K
authors.initials: K
authors.lastname: Takenaka
authors.forename: S
authors.initials: S
authors.lastname: Niitaka
authors.forename: T
authors.initials: T
authors.lastname: Sasagawa
authors.forename: S
authors.initials: S
authors.lastname: Sugai
authors.forename: H
authors.initials: H
authors.lastname: Takagi