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  • Springer  (2)
  • 1970-1974  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    The electron paramagnetic resonance of manganese in Mo1−x Ga4Mn x (1972)
    Springer
    Journal of low temperature physics 7 (1972), S. 319-334 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report the results of electron paramagnetic resonance experiments on managanese dissolved in MoGa 4 over the temperature range 293-1.8 K. It is found that both theg shift and the line width show an anomalous sharp concentration independent increase as the temperature is decreased from 100 to 4.2 K. The experimental results for the relaxation rate andg shift are analyzed in terms of currently available theories and found to be unexplained by them. A model is proposed for the alloys invoking a bottleneck effect at high temperatures which breaks down at low temperatures due to the onset of a Kondo effect. When the bottleneck effect is broken down it is suggested that the theories for the unbottlenecked regime again become applicable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00660070
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  • 2
    Electronic Resource
    Electronic Resource
    The behavior of magnetic and nonmagnetic impurities in the system Nb76Pt24−x Fe x (1974)
    Springer
    Journal of low temperature physics 17 (1974), S. 223-246 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We find that Fe is magnetic when introduced as an impurity in the A-15 super-conductor Nb 76 Pt 24 . The ternary diagram of the system Nb-Pt-Fe is presented. The Fe impurities show a magnetic behavior when they are on the linear chains (Nb sites) and a nonmagnetic behavior when they are on the cubic sites (Pt sites). Supposing that the Fe atoms have a pair-breaking effect as well as a nonmagnetic effect on the superconducting state and determining the latter by adding nonmagnetic impurities (Ru), we are able to fit the measured critical field as a function of temperature to the WHH theory generalized to include magnetic impurities. The analysis shows that the exchange interactionJ between conduction electrons and the Fe atoms is negative. A Jaccarino-Peter compensation effect takes place at about 2 at % Fe. The inverse Fe susceptibility curves are fitted using a model of short-range interactions between impurities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00659071
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    Paper (German National Licenses)
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