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An optical study of NdNiO(3) 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.

physical review letters

Mott Physics near the Insulator-To-Metal Transition in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>NdNiO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>

Mott Physics near the Insulator-To-Metal Transition inNdNiO3