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  • Artikel: DFG Deutsche Nationallizenzen  (2)
  • 76.80.+7  (1)
  • PACS. 78.70.Dm X-ray absorption spectra – 71.28.+d Narrow-band systems; intermediate-valence solids – 79.60.-i Photoemission and photoelectron spectra  (1)
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  • Artikel: DFG Deutsche Nationallizenzen  (2)
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  • 1
    Digitale Medien
    Digitale Medien
    High-pressure phases of CuI studied by129I-Mössbauer spectroscopy (1992)
    Springer
    Hyperfine interactions 72 (1992), S. 251-257 
    Details
    ISSN: 1572-9540
    Schlagwort(e): 64.70 Kb ; 76.80.+7 ; 62.50.+p
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The results of an129I-Mössbauer study of the high-pressure phases of CuI at 4.2 K and for external pressures up to 71 kbar are reported. The isomer shiftS and the electric quadrupole interactionE q are found to undergo larges discontinuities at the crystallographic phase-transition pressures of ≅18 kbar from zinc-blence to rhombohedral structure and at ≅46 kbar from rhombohedral to tetragonal. The pressure coefficients of these hyperfine parameters are significantly different for the three phases (zinc-blende; rhombohedral; tetragonal) dS/dP=−3.3; =+1.5; =2.5×10−3 mm/s/kbar; dE q/dP=0.0; =−0.92;=+0.31 Mc/s/kbar. These results cannot be explained in terms of a simple molecular-orbital picture; instead, they reflect pressure-induced variations of the halogen-p/metal-d hybridization in the valence bands of the various phases of CuI.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02398869
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    Artikel (Nationallizenzen)
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  • 2
    Digitale Medien
    Digitale Medien
    The electronic structure of the doped one-dimensional transition metal oxide Y 2 - x Ca x BaNiO 5 studied using X-ray absorption (2002)
    Springer
    The European physical journal 26 (2002), S. 449-453 
    Details
    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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