Abstract

Understanding and controlling the metal–insulator transition (MIT) can provide great opportunities for electronic devices. Here, artificial LaNiO3/(NiO)n/LaNiO3 has been synthesized. MIT temperatures have been tuned by changing the thickness of the artificial NiO insert layer. The Ni 2p core-level spectra and O K-edge have been investigated. The linear relationship between the hybridization T (or bandwidth W) and the MIT temperature has been clearly demonstrated. In this work, we realized the Mott ground state by modulating the parameters of T and the covalency W, which might be significant for the development of multifunctional materials.

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