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Polarization-depend...
Polarization-dependent nickel 2p x-ray-absorption spectra of La2NiO4+δ
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- Kuiper, Pieter, 1960- (författare)
- Högskolan i Halmstad,Uppsala University, Uppsala, Sweden
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- Elp, J. van (författare)
- University of Aarhus, Aarhus, Denmark
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- Rice, D. E. (författare)
- University of Delaware, Newark, Delaware, USA
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- Buttrey, D. J. (författare)
- University of Delaware, Newark, Delaware, USA
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- Lin, H. J. (författare)
- AT&T Bell Laboratories, Murray Hill, New Jersey, USA
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- Chen, C. T. (författare)
- AT&T Bell Laboratories, Murray Hill, New Jersey, USA; National Synchrotron Radiation Research Center (SRRC), Hsinchu, Taiwan
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(creator_code:org_t)
- College Park, MD : American Physical Society, 1998
- 1998
- Engelska.
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Ingår i: Physical Review B Condensed Matter. - College Park, MD : American Physical Society. - 0163-1829 .- 1095-3795. ; 57:3, s. 1552-1557
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- We present polarization dependent x-ray-absorption spectra at nickel L edges of well-characterized La2NiO4+δ single crystals. In the stoichiometric compound the splitting between the x2−y2 and the 3z2−r2 orbitals is 0.7 eV, according to a fit of the 2p53d9 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 NiO6 octahedra, and delocalizes the hole over all six ligands.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Nyckelord
- 78.70.Dm
- 71.70.Ch
- 63.20.Kr
- X-ray absorption spectra
- Crystal and ligand fields
- Phonon-electron and phonon-phonon interactions
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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