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  • Springer  (4)
  • 1990-1994  (4)
  • 1905-1909
  • 1
    Electronic Resource
    Electronic Resource
    Calculation of hyperfine interaction parameters in metals-friedel oscillations in dilute Fe and Cu alloys (1990)
    Springer
    Hyperfine interactions 60 (1990), S. 547-562 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We review some recent calculations on hyperfine interaction parameters in metals based on density functional theory in the local density approximation. We restrict ourselves to the calculation of Friedel oscillations of the charge and magnetization density in dilute Fe and Cu alloys. In particular, we estimate hyperfine fields, isomer shifts and electric field gradients for a few shells around the impurities. The calculations are performed using the KKR-Green's function method. Especially, we discuss which valence properties determine the hyperfine interaction parameters and what information about the electronic structure can be obtained from their measurement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02399824
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  • 2
    Electronic Resource
    Electronic Resource
    NMR properties of hcp Ru metal — first detection of the99Ru and101Ru NMR in a paramagnetic solid (1993)
    Springer
    Hyperfine interactions 80 (1993), S. 1015-1018 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Results of nuclear magnetic resonance (NMR) measurements on hexagonal close-packed Rumetal are presented. The field spectra of both isotopes, having a nuclear spinI of 5/2, show a shape characteristic for quadrupolar disturbed NMR. From a simulation of these spectra, the electric field gradientV zz has been determined to be (37±0.5)×10−13 esu/cm3 in agreement with recent band structure calculations. The Knight shift tensor elements deduced from the spectra areK x =K y =0.46±0.02% andK z =0.56±0.02%. These rather high and positive shifts are completely in line with that of the neighboring elements in the periodic system and have primarily to be ascribed to the Van Vleck contribution. This part of the Knight shift is also responsible for the rather strong anisotropy, that has been found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00567457
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  • 3
    Electronic Resource
    Electronic Resource
    Experimental and theoretical investigations of the Knight shift of Pd and Ag in the alloy system Ag x Pd1−x (1993)
    Springer
    Hyperfine interactions 80 (1993), S. 1011-1014 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Knight shift of Pd in Ag x Pd1−x has been determined for concentrationsx≦0.2. In full accordance with the expectations based on the behaviour of the magnetic susceptibility, it was found that the Knight shift of Pd is rapidly reduced in magnitude by adding Ag to Pd. To allow for a detailed interpretation of this finding, we have performed Korringa-Kohn-Rostoker coherent potential approximation (KKR-CPA) band structure calculations for Ag x Pd1−x . These calculations clearly demonstrate that the decrease in spin susceptibility with increasingx is accompanied with a decrease in core polarization. In contrast to Pd, the negative Knight shift of Ag on the Pd-rich side of the system is caused by the valence band contribution, as it is demonstrated by our calculations. This is caused by an intersite effect in analogy to the transferred hyperfine field found for non-magnetic elements dissolved in a magnetic host.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00567456
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  • 4
    Electronic Resource
    Electronic Resource
    Consequences of relativity for the hyperfine interactions — with applications to transition metals (1993)
    Springer
    Hyperfine interactions 78 (1993), S. 361-375 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The strong influence of relativity on the hyperfine interaction is demonstrated by non-, scalar andfully relativistic calculations for solid transition metal systems. By calculations of hyperfine fields andof the nuclear spin lattice relaxation rate of Ag in Ag x Pt1−x it is shown that scalar relativistic calculations, which neglect the influence of spin-orbit coupling, seem to be sufficient to account for relativistic effects in many cases. To account properly for the symmetry-breaking caused by spin-orbit coupling, which is reflected by many hyperfine interaction properties, a fully relativistic approach is demanded. The corresponding formalism in the framework of the KKR-GF (Korringa-Kohn-Rostoker-Green's function) method of band structure calculation for magnetic solids is outlined. As applications results for the hyperfine fields of pure transition metals andalloys are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00568160
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