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  • 1975-1979  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Negative ion motion in normal and superfluid 3He (1978)
    Springer
    Journal of low temperature physics 30 (1978), S. 205-228 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: We report the first measurements of negative ion motion in the superfluid phases of 3He and in the normal phase below 17 mK. Refrigeration was achieved with nuclear demagnetization of copper and we used a pulsed NMR platinum powder thermometer immersed in the liquid. In the A phase the longitudinal resonance frequency provided an additional high-resolution thermometer. In the normal phase we observed a strictly temperature-independent mobility. In the superfluid phases we found two velocity regimes. For small applied electric fields the velocity is a linear function of the field and the corresponding mobility increases monotonically toward lower temperatures. At high electric fields the velocity is a nonlinear function of the field as a result of the pair-breaking effect of the moving ion. Available theoretical calculations are only in partial agreement with our results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00115525
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Positive ion mobility in normal and superfluid 3He (1978)
    Springer
    Journal of low temperature physics 33 (1978), S. 69-78 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: The mobility of positive ions has been measured in the normal and superfluid phases of 3He at several pressures. Below 100 mK the normal phase mobility increases logarithmically with decreasing temperature down to the superfluid transition temperature T c; it shows an anomalous jump near 100 mK. At low temperatures the drift velocity is nonlinear for electric fields exceeding 30 V/cm. In the superfluid the mobility, normalized to its value at T c, is much less than for negative ions. We have also observed the anisotropic mobility in the A phase and the Landau critical velocity for pair-breaking in both superfluid phases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00117066
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    Paper (German National Licenses)
    Fulltext
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