Dimensionality-Controlled Evolution of Charge-Transfer Energy in Digital Nickelates Superlattices.

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 c

SUBMITTER: Lu X 

PROVIDER: S-EPMC9313943 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature