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  • Articles: DFG German National Licenses  (2)
  • 1985-1989  (2)
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  • Articles: DFG German National Licenses  (2)
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Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Spin-polarized photoelectron diffraction: A new probe of short-range magnetic order (invited) (abstract) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3506-3506 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It has recently been pointed out theoretically and subsequently observed experimentally that core-level multiplet splittings can be used to yield a spin-polarized form of photoelectron diffraction (SPPD). This internally referenced source of electrons that are highly polarized with both orientations of spin thus eliminates the need for an external spin detector, permits studying both ferromagnetic and antiferromagnetic specimens, and can, in principle, detect short-range magnetic or for temperatures above the Curie or Néel temperature. In the first measurements of this type on the antiferromagnet KMnF3, an abrupt loss of short-range order at a transition temperature considerably above the bulk Néel temperature of the material was observed. More recent theoretical diffraction calculations have pointed out several ways in which SPPD should permit deriving unique information on short-range spin-order structures at and near the surfaces of magnetic materials. New experimental results have also been obtained for the antiferromagnet MnO. This paper will discuss these new developments, will review the advantages and disadvantages of SPPD, and also will consider some interesting future directions of investigation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340724
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    On the electronic structure of the light rare earth hydrides (1985)
    Springer
    The European physical journal 61 (1985), S. 113-128 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Photoemission (XPS, HeI) and inverse photoemission (hv=9.7 eV) data on Y, La, Ce, Pr and their hydrides are presented. The discussion focusses on the ground state electronic properties of the hydrides and in particular on the empty density of states. In addition the correlation effects which appear in these experimental techniques in the presentce of well localized, partly filled 4f states are stressed. Hybridization is displayed in three typical situations:a) The very existence of a weak 4f-conduction band mixing allows electronic transitions into 4f derived states to be observed by low energy BIS, although the cross section is exceedingly small at this energy-b) 3d core excitation pulls the empty 4f levels close to the hydrogen ligand levels such that they become strongly mixed and the screening level is markedly split-c) A schematic relation is found between core level shifts upon hydriding, charge transfer and the position of the hydrogen induced band, simply by considering the mixing of hydrogen ligand states with metald states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01307765
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    Paper (German National Licenses)
    Fulltext
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