Evolution of electronic structure across the rare-earth RNiO3 series

Freeland, John W.; van Veenendaal, Michel; Chakhalian, Jak

doi:10.1016/j.elspec.2015.07.006

Evolution of electronic structure across the rare-earth RNiO₃ series

Journal Article · Fri Jul 31 00:00:00 EDT 2015 · Journal of Electron Spectroscopy and Related Phenomena

DOI:https://doi.org/10.1016/j.elspec.2015.07.006· OSTI ID:1360222

Freeland, John W. ^[1]; van Veenendaal, Michel ^[2]; Chakhalian, Jak ^[3]

Argonne National Lab. (ANL), Argonne, IL (United States)
Northern Illinois Univ., DeKalb, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
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.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: Argonne National Laboratory - Advanced Photon Source; USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-06CH11357; FG02-03ER46097

OSTI ID:: 1360222

Alternate ID(s):: OSTI ID: 1247221

Journal Information:: Journal of Electron Spectroscopy and Related Phenomena, Journal Name: Journal of Electron Spectroscopy and Related Phenomena Journal Issue: C Vol. 208; ISSN 0368-2048

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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