Journal
PHYSICAL REVIEW LETTERS
Volume 107, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.107.176401
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Funding
- DOE-BES
- DOD-ARO [0402-17291]
- NSF [DMR-0747808]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [747808] Funding Source: National Science Foundation
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An optical study of NdNiO3 ultrathin films with insulating and metallic ground states reveals new aspects of the insulator-to-metal transition that point to Mott physics as the driving force. In contrast with the behavior of charge-ordered systems, we find that the emergence of the Drude resonance across the transition is linked to a spectral weight transfer over an energy range of the order of the Coulomb repulsion U, as the energy gap is filled with states instead of closing continuously.
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