Correlation-driven heavy-fermion formation in LiV2O4.
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.
Jönsson
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PE
RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
Takenaka
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K
Niitaka
S
S
Sasagawa
T
T
Sugai
S
S
Takagi
H
H