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Title: Polarization-dependent nickel 2p x-ray-absorption spectra of La{sub 2}NiO{sub 4+{delta}}

Abstract

We present polarization dependent x-ray-absorption spectra at nickel L edges of well-characterized La{sub 2}NiO{sub 4+{delta}} single crystals. In the stoichiometric compound the splitting between the x{sup 2}{minus}y{sup 2} and the 3z{sup 2}{minus}r{sup 2} orbitals is 0.7 eV, according to a fit of the 2p{sup 5}3d{sup 9} multiplet to the spectra. This value is in agreement with an assignment of dd excitations of the optical spectrum. The Ni L edges of the doped compound are consistent with the isotropic prepeak observed at the oxygen 1s edge. Theory does not predict holes on the apex oxygens, but we argue that doping causes a polaronic deformation which reduces the tetragonal distortion of the NiO{sub 6} octahedra, and delocalizes the hole over all six ligands. {copyright} {ital 1998} {ital The American Physical Society}

Authors:
 [1];  [2]; ;  [3]; ;  [4]
  1. Department of Physics, Uppsala University, Box 530, S-751 21 Uppsala (Sweden)
  2. ISA, Institute of Physics and Astronomy, University of Aarhus, DK-8000 Aarhus C (Denmark)
  3. Department of Chemical Engineering, University of Delaware, Newark, Delaware 19716 (United States)
  4. ATT Bell Laboratories, Murray Hill, New Jersey 07974 (United States)
Publication Date:
OSTI Identifier:
567059
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter
Additional Journal Information:
Journal Volume: 57; Journal Issue: 3; Other Information: PBD: Jan 1998
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 66 PHYSICS; LANTHANUM COMPOUNDS; LANTHANUM OXIDES; NICKEL OXIDES; ABSORPTION SPECTRA; X-RAY SPECTROSCOPY; MONOCRYSTALS; STOICHIOMETRY; MULTIPLETS; L SHELL; POLARONS; LIGANDS

Citation Formats

Kuiper, P, van Elp, J, Rice, D E, Buttrey, D J, Lin, H, and Chen, C T. Polarization-dependent nickel 2p x-ray-absorption spectra of La{sub 2}NiO{sub 4+{delta}}. United States: N. p., 1998. Web. doi:10.1103/PhysRevB.57.1552.
Kuiper, P, van Elp, J, Rice, D E, Buttrey, D J, Lin, H, & Chen, C T. Polarization-dependent nickel 2p x-ray-absorption spectra of La{sub 2}NiO{sub 4+{delta}}. United States. https://doi.org/10.1103/PhysRevB.57.1552
Kuiper, P, van Elp, J, Rice, D E, Buttrey, D J, Lin, H, and Chen, C T. 1998. "Polarization-dependent nickel 2p x-ray-absorption spectra of La{sub 2}NiO{sub 4+{delta}}". United States. https://doi.org/10.1103/PhysRevB.57.1552.
@article{osti_567059,
title = {Polarization-dependent nickel 2p x-ray-absorption spectra of La{sub 2}NiO{sub 4+{delta}}},
author = {Kuiper, P and van Elp, J and Rice, D E and Buttrey, D J and Lin, H and Chen, C T},
abstractNote = {We present polarization dependent x-ray-absorption spectra at nickel L edges of well-characterized La{sub 2}NiO{sub 4+{delta}} single crystals. In the stoichiometric compound the splitting between the x{sup 2}{minus}y{sup 2} and the 3z{sup 2}{minus}r{sup 2} orbitals is 0.7 eV, according to a fit of the 2p{sup 5}3d{sup 9} multiplet to the spectra. This value is in agreement with an assignment of dd excitations of the optical spectrum. The Ni L edges of the doped compound are consistent with the isotropic prepeak observed at the oxygen 1s edge. Theory does not predict holes on the apex oxygens, but we argue that doping causes a polaronic deformation which reduces the tetragonal distortion of the NiO{sub 6} octahedra, and delocalizes the hole over all six ligands. {copyright} {ital 1998} {ital The American Physical Society}},
doi = {10.1103/PhysRevB.57.1552},
url = {https://www.osti.gov/biblio/567059}, journal = {Physical Review, B: Condensed Matter},
number = 3,
volume = 57,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 1998},
month = {Thu Jan 01 00:00:00 EST 1998}
}