2015/04/10 by J. W. Freeland, Freeland, John W., Michel van Veenendaal +3 · 2 citations
Materials Science · #Chemical and Physical Properties of Materials #FOS: Physical sciences #Glass properties and applications #Materials Science (cond-mat.mtrl-sci) #Metallurgical and Alloy Processes #Strongly Correlated Electrons (cond-mat.str-el)
paper · pdf · doi:10.48550/arxiv.1504.02802
openalex publication_date 2015/04/10 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The perovksite rare-earth nickelates, RNiO3 (R=La ... Lu), are a class of materials displaying a rich phase-diagram of metallic and insulating phases associated with charge and magnetic order. Being in the charge transfer regime, Ni3+ in octahedral coordination displays a strong hybridization with oxygen to form 3d - 2p mixed states, which results in a strong admixture of 3d8\underlineL into 3d7, where \underlineL denotes a hole on the oxygen. To understand the nature of this strongly hybridized ground state, we present a detailed study of the Ni and O electronic structure using high-resolution soft X-ray Absorption Spectroscopy (XAS). Through a comparison of the evolution of the XAS line-shape at Ni L- and O K-edges across the phase diagram, we explore the changes in the electronic signatures in connection with the insulating and metallic phases that support the idea of hybridization playing a fundamental role.