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  • 1985-1989  (2)
  • 1975-1979  (2)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Non-ohmic conduction in doped polyacetylene at low temperatures (1986)
    Springer
    The European physical journal 64 (1986), S. 19-23 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The electrical conductivity of a iodine-doped polyacetylene is measured as a function of the electric field ℰ at temperatures between 4K and 0.3K. We find that after an initial non-linear behavior σ increases linearly with ℰ in agreement with a theoretical description based on variable-range hopping conduction. The non-linear rise at low fields depends on the iodine concentration. In heavily doped samples the increase is small and varies as ℰ2, whereas in less conductive samples a large change is observed at 0.3K which varies approximately as log ℰ for fields from 1 V/m to 150 V/m.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01313684
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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)
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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    Variable-range hopping conduction in doped germanium at very low temperatures and high magnetic fields (1988)
    Springer
    The European physical journal 71 (1988), S. 455-463 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The conductivity of doped Ge below the metal-insulator transition is measured at temperatures between 4 K and 40 mK and in magnetic fields up to 7 Tesla. In zero field the resistivity exponent diverges asT −1/2. In weak fields the magnetoresistance increases asB 2 and becomes exponentially large in strong fields and at low temperatures. The results can be described quantitatively in terms of variable-range hopping between localized states having a Coulomb gap in the density of states at the Fermi level. The magnetoresistance is calculated for arbitrary fields by means of a quasi-classical method. A fit to the data gives the radius of the localized states and the density of states. The sample is found to be very close to the metal-insulator transition. A small increase of the binding energy is observed in strong fields.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01313932
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    Paper (German National Licenses)
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