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- W2483173506 abstract "The metal-insulator transitions and the intriguing physical properties of rare-earth perovskite nickelates have attracted considerable attention in recent years. Nonetheless, a complete understanding of these materials remains elusive. Here, taking a NdNiO3 thin film as a representative example, we utilize a combination of x-ray absorption and resonant inelastic x-ray scattering (RIXS) spectroscopies to resolve important aspects of the complex electronic structure of the rare-earth nickelates. The unusual coexistence of bound and continuum excitations observed in the RIXS spectra provides strong evidence for the abundance of oxygen 2p holes in the ground state of these materials. Using cluster calculations and Anderson impurity model interpretation, we show that these distinct spectral signatures arise from a Ni 3d8 configuration along with holes in the oxygen 2p valence band, confirming suggestions that these materials do not obey a conventional positive charge-transfer picture, but instead exhibit a negative charge-transfer energy, in line with recent models interpreting the metal to insulator transition in terms of bond disproportionation." @default.
- W2483173506 created "2016-08-23" @default.
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- W2483173506 date "2016-10-11" @default.
- W2483173506 modified "2023-10-02" @default.
- W2483173506 title "Ground-state oxygen holes and the metal–insulator transition in the negative charge-transfer rare-earth nickelates" @default.
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- W2483173506 doi "https://doi.org/10.1038/ncomms13017" @default.
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