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