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  • 1980-1984  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    On muon localization in doped aluminium samples (1984)
    Springer
    Hyperfine interactions 17 (1984), S. 197-201 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The magnetic field dependence of the transverseμSR linewidth has been studied in anAlAg single crystal. The muon site is found to be tetrahedral at 22 K and octahedral at 0.05 K. Both the site change and the magnitudes of the electric field gradients are similar to previous observations onAlMn, although these two impurities create different strain fields in Al.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02065902
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The positive muon as a tracer for the study of metal hydrogen systems (1984)
    Springer
    Hyperfine interactions 17 (1984), S. 261-266 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present the first systematic study of dynamic muon H-correlations in a metal hydride (NbH x ) over a large range of H concentrations. The following observations were made: (i) H loading shifts the motional narrowing range for muons in Nb from 60 K to above 170 K; (ii) inβ-NbH x muon (τμ) and H correlation times are of the same order but the corresponding activation energies are distinctly different; (iii) the concentration dependence of τμ −1 exhibits strong negative deviations from a (1-c) behavior; (iv) the H/D isotope effect inβ-NbH(D)0.92 is distinctly non-classical; (v) the ordering of vacancies in the subhydrides suppresses long range muon motion. The experimental features are interpreted in the framework of tracer diffusion theory and bear clear evidence that repulsive muon-H interactions are an important feature of the dynamic muon hydrogen correlations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02065912
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Mobility of muons in Cu below 2 K (1984)
    Springer
    Hyperfine interactions 17 (1984), S. 117-124 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have performed transverse fieldμSR experiments on several different samples of copper in the temperature range below 2 K, including isotope separated Cu and impurity doped polycrystalline Cu. We do not observe any strong effect of the isotope composition of the sample. A63Cu and a natural Cu sample of identical purity both yield 0.16μs−1 for the low-temperature plateau, while an increased linewidth in the65Cu case may be related to the strong effects of Fe impurities. Careful transverse field measurements on large single crystals at 0.08 K reveal non-Gaussian lineshapes in accordance with the picture of diffusing muons at this temperature. This allows us to reject several of the existing models for muon behaviour in copper below 2 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02065891
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Initial or thermally controlled impurity trapping of muons in niobium? (1984)
    Springer
    Hyperfine interactions 17 (1984), S. 183-190 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have studied muon depolarization in some very well characterized samples of niobium (pure Nb with 〈1 ppm impurities and Nb doped with 15 at.ppm N and 53 at.ppm Ta, respectively). This has allowed us to separate the influence of substitutional and interstitial impurities on theμSR linewidthσ. The purest sample shows a low but non-zero linewidth from 0.1 to 70 K. Ta-doping increases the width strongly below 20 K. while N-doping gives a broad maximum between 30–70 Kand a considerable width below 20 K. Conventional two-trap models cannot explain the occurrence of a linewidth significantly lower that that predicted for staticμ + and constant over a wide temperature range. A consistent explanation of these three observations can however be obtained from the following model: In pure Nb only a fraction of the muons is self-trapped thermally; the other muons do not form small polarons but remain in a propagating metastable nonlocalized state. Impurities can catalyse further initial polaron formation, decreasing the metastable fraction. This process causes temperature-independent plateaus inσ up to the detrapping temperature. The muons localized at shallow traps (Ta induced) can diffuse at higher temperatures and be trapped again at deeper traps (associated with the N-impurities).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02065900
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    Paper (German National Licenses)
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