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  • rare earth magnetism  (1)
  • zinc oxide  (1)
  • 2000-2004  (2)
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  • 2000-2004  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Hyperfine interactions 130 (2000), S. 241-273 
    ISSN: 1572-9540
    Keywords: zinc oxide ; zinc ferrite ; quadrupolar interactions ; nanostructured magnet ; spin glass ; superparamagnetism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract ZnO and ZnFe2O4 were investigated in nanocrystalline form using various hyperfine techniques in conjunction with neutron diffraction and bulk magnetic measurements. For the zinc oxide, the main interest was the influence of the nanocrystalline state on lattice dynamics and on the local symmetry of the Zn atom as reflected in its quadrupolar coupling, employing the high-resolution Mössbauer resonance of 67Zn. Measurements were carried out on nanocrystalline materials with particle sizes between 4 and 25 nm. It was found that the asymmetry parameter increases drastically from η=0 in ZnO single crystals to η≈0.5 in nanostructured material, indicating an off-axis displacement of either Zn or O atoms in finite size grains. The dependences of the Lamb-Mössbauer factor on grain size and temperature are well described by a two-component model in which small crystallites are surrounded by a network of grain boundaries. For the zinc ferrite the question of changes in the magnetic properties stood in the foreground. Using the combination of techniques mentioned, the magnetic behavior of nanocrystalline ZnFe2O4, which had an average particle size of about 9 nm was compared to differently prepared crystalline samples. It was seen that the role of cation-site occupation, which changes substantially with nanocrystallinity, plays a decisive role for the magnetic properties.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1572-9540
    Keywords: muon spin rotation/relaxation ; rare earth magnetism ; frustrated magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract After a short introduction to μSR with respect to the study of magnetic properties, followed by a brief outline of the principle of the high pressure-low temperature μSR spectrometer installed at the Paul Scherrer Institute, we discuss some measurements on rare earth materials employing this instrument. They are concerned with: (1) The pressure dependence of the spin turning process in ferromagnetic Gd. (2) The volume dependence of the internal magnetic field in the heavy rare earth metals Gd, Dy, and Ho in their ordered magnetic states. (3) The response of the (first order) magnetic transition in the frustrated antiferromagnets of type RMn2 (R = Y,Gd) to pressure. (4) The variation of magnetic parameters with pressure in La2CuO4 (powder sample), the antiferromagnetic parent compound of the high TC superconductors of type La2−x(Sr, Ba)xCuO4. In conclusion a short outlook on further developments is given.
    Type of Medium: Electronic Resource
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