Abstract
We carried out temperature-dependent (20–550 K) measurements of resonant inelastic x-ray scattering on to investigate the evolution of its electronic structure across the spin-state crossover. In combination with charge-transfer multiplet calculations, we accurately quantified the renomalized crystal-field excitation energies and spin-state populations. We show that the screening of the effective on-site Coulomb interaction of electrons is orbital selective and coupled to the spin-state crossover in . The results establish that the gradual spin-state crossover is associated with a relative change of Coulomb energy versus bandwidth, leading to a Mott-type insulator-to-metal transition.
- Received 29 June 2017
DOI:https://doi.org/10.1103/PhysRevLett.119.196402
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