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The electronic structure of the doped one-dimensional transition metal oxide Y 2 - x Ca x BaNiO 5 studied using X-ray absorption (2002)

Hu, Z. ; Knupfer, M. ; Kielwein, M. ; [weitere]

Springer

The European physical journal 26 (2002), S. 449-453

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ISSN: 1434-6036

Schlagwort(e): PACS. 78.70.Dm X-ray absorption spectra – 71.28.+d Narrow-band systems; intermediate-valence solids – 79.60.-i Photoemission and photoelectron spectra

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract: A strong anisotropic distribution of the holes in Ni 3 d and O 2 p orbitals is observed in the polarization dependent O 1 s and Ni 2 p 3/2 X-ray absorption spectroscopy of the linear-chain nickelate Y2-xCaxBaNiO5 (x = 0, 0.05, 0.1, 0.2), which demonstrates the one-dimensional nature of the electronic state in these compounds. The holes introduced by Ca-doping occupy both O 2 p and Ni 3 d orbitals along the NiO5 chains. By comparing the experimental Ni 2 p 3/2 absorption spectra of Y2-xCaxBaNiO5 to those from charge transfer multiplet calculations we can derive the orbital character of the additional holes to be of ∼60% O2 p and ∼40% Ni 3 d.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1140/epjb/e20020113

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