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Title: Evolution of electronic structure across the rare-earth RNiO3 series

Journal Article · · Journal of Electron Spectroscopy and Related Phenomena
 [1];  [2];  [3]
  1. Argonne National Lab. (ANL), Argonne, IL (United States)
  2. Northern Illinois Univ., DeKalb, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Univ. of Arkansas, Fayetteville, AR (United States)

Here, 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 3d8L_ into 3d7, where L_ 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.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
Argonne National Laboratory - Advanced Photon Source; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357; GBMF4534; 0402-17291
OSTI ID:
1360222
Alternate ID(s):
OSTI ID: 1247221
Journal Information:
Journal of Electron Spectroscopy and Related Phenomena, Vol. 208, Issue C; ISSN 0368-2048
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 52 works
Citation information provided by
Web of Science

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Ground-state oxygen holes and the metal–insulator transition in the negative charge-transfer rare-earth nickelates journal October 2016
Organismic materials for beyond von Neumann machines journal March 2020
Hybridization-controlled charge transfer and induced magnetism at correlated oxide interfaces journal January 2016
Metal–insulator-transition engineering by modulation tilt-control in perovskite nickelates for room temperature optical switching journal September 2018
Reproducibility and off-stoichiometry issues in nickelate thin films grown by pulsed laser deposition journal January 2017
Site-Selective Probe of Magnetic Excitations in Rare-Earth Nickelates Using Resonant Inelastic X-ray Scattering text January 2018
Bond disproportionation and dynamical charge fluctuations in the perovskite rare earth nickelates text January 2016
Reproducibility and off-stoichiometry issues in nickelate thin films grown by pulsed laser deposition text January 2017
Epitaxial strain modulated electronic properties of interface controlled nickelate superlattice text January 2018
Pure electronic metal-insulator transition at the interface of complex oxides journal June 2016