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Polarization-dependent nickel 2p x-ray-absorption spectra La2NiO4+δ
Högskolan i Halmstad. Department of Physics, Uppsala University, Uppsala, Sweden.
ISA, Institute of Physics and Astronomy, University of Aarhus, Aarhus, Denmark.
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1998 (Engelska)Ingår i: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 57, nr 3, s. 1552-1557Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We present polarization dependent x-ray-absorption spectra at nickel (Formula presented) edges of well-characterized (Formula presented) single crystals. In the stoichiometric compound the splitting between the (Formula presented) and the (Formula presented) orbitals is 0.7 eV, according to a fit of the (Formula presented) multiplet to the spectra. This value is in agreement with an assignment of (Formula presented) excitations of the optical spectrum. The Ni (Formula presented) edges of the doped compound are consistent with the isotropic prepeak observed at the oxygen (Formula presented) 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(Formula presented) octahedra, and delocalizes the hole over all six ligands. © 1998 The American Physical Society.

Ort, förlag, år, upplaga, sidor
College Park, MD: American Physical Society, 1998. Vol. 57, nr 3, s. 1552-1557
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Den kondenserade materiens fysik
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URN: urn:nbn:se:hh:diva-40747DOI: 10.1103/PhysRevB.57.1552ISI: 000071716800047Scopus ID: 2-s2.0-0000542357OAI: oai:DiVA.org:hh-40747DiVA, id: diva2:1362373
Tillgänglig från: 2019-10-18 Skapad: 2019-10-18 Senast uppdaterad: 2019-10-18

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