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- W4225376263 abstract "Fundamental understanding and control of the electronic structure evolution in rare-earth nickelates is a fascinating and meaningful issue, as well as being helpful to understand the mechanism of recently discovered superconductivity. Here the dimensionality effect on the ground electronic state in high-quality (NdNiO3 ) m /(SrTiO3 )1 superlattices is systematically studied through transport and soft X-ray absorption spectroscopy. The metal-to-insulator transition temperature decreases with the thickness of the NdNiO3 slab decreasing from bulk to 7 unit cells, then increases gradually as m further reduces to 1 unit cell. Spectral evidence demonstrates that the stabilization of insulating phase can be attributed to the increase of the charge-transfer energy between O 2p and Ni 3d bands. The prominent multiplet feature on the Ni L3 edge develops with the decrease of NdNiO3 slab thickness, suggesting the strengthening of the charge disproportionate state under the dimensional confinement. This work provides convincing evidence that dimensionality is an effective knob to modulate the charge-transfer energy and thus the collective ground state in nickelates." @default.
- W4225376263 created "2022-05-05" @default.
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- W4225376263 date "2022-05-23" @default.
- W4225376263 modified "2023-09-25" @default.
- W4225376263 title "Dimensionality‐Controlled Evolution of Charge‐Transfer Energy in Digital Nickelates Superlattices" @default.
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- W4225376263 doi "https://doi.org/10.1002/advs.202105864" @default.
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