Mott physics near the insulator-to-metal transition in NdNiO3 |
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Authors: | Stewart M K Liu Jian Kareev M Chakhalian J Basov D N |
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Affiliation: | Department of Physics, University of California-San Diego, La Jolla, California 92093, USA. mstewart@physics.ucsd.edu |
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Abstract: | 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. |
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