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  • 1975-1979  (6)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Superconductivity in ultrathin films (1975)
    Springer
    The European physical journal 20 (1975), S. 241-245 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is shown that the pair breaking parameter of the Maki-Thompson contributions to the fluctuation conductivity above the superconducting transition temperature has the same thickness dependence as the transition temperature depression in very thin amorphous Be-Al films. Both can be ascribed to an extremely thin surface sheath with suppressed superconductivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01352585
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Comment on “preparation of amorphous films of tin by quench condensation with impurities” (1975)
    Springer
    The European physical journal 21 (1975), S. 127-129 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A recent paper by Buck [1] reported on a detailed investigation of quenchcondensed tin films with additions of various impurities. It was shown that the highest temperature to which an amorphous lattice order persisted scaled with the concentration of valence electrons, thus indicating that the amorphous state would be dependent on the electronic structure. Here, we show that the same crystallization temperatures also scale with the melting point of the impurity element in agreement with our previous observations [2], i.e. crystallization can be understood as due to the onset of impurity diffusion. It is also shown that the latter explanation, but not the former, can account as well for data on lead and thallium based compounds, indicating the more universal nature of the scaling of the crystallization temperature with the impurity element melting point.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01322241
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Superconductivity of vapour quenched beryllium and beryllium-based alloys (1975)
    Springer
    The European physical journal 20 (1975), S. 13-20 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The properties of Be films, quench-condensed upon a3He cooled substrate, have been investigated by resistance and tunneling measurements. The superconducting transition temperature,T c , of Be films increased with thickness and a thick film limit of 9.95 K could be estimated. Alloying with Al or Pb decreasedT c. The ratios between energy gaps andT c 's indicated that Be is a weak coupling superconductor, and no phonon induced structure could be traced in tunneling curves neither in pure Be nor in the Be based alloys. Resistance change during annealing as well as superconducting data indicated that the vapour quenched Be films were amorphous as deposited.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01313906
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Optical absorption of ultrafine metal spheres with dielectric cores (1978)
    Springer
    The European physical journal 30 (1978), S. 47-51 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We compute the optical absorption of a glass containing a small fraction of silver particles with dielectric cores. The results are based on the Maxwell Garnett formalism. The dielectric permeability of the metallic shells is obtained by modifying experimental data for bulk silver to account for size dependent scattering of the conduction electrons. We find an absorption maximum in the visible range at a wavelength which, for sufficiently minute particles, depends rather strongly on the size of the cores and on their dielectric constant. The relevance of these results to recent experimental data by Smithard and by Genzel et al. is pointed out. We argue that their observed absorption maxima can be explained without invoking any quantum effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01323667
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Far infrared absorption in ultrafine metallic particles: Calculations based on classical and quantum mechanical theories (1978)
    Springer
    The European physical journal 30 (1978), S. 29-46 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Detailed calculations of far infrared absorption in ultrafine metallic particles are reported. Effective medium treatments of the composite of particles and their surrounding are carried out within the Maxwell Garnett and Bruggeman theories. Generalizations of these to encompass dipole-dipole interaction and oxide pellicles are discussed. The dielectric permeability of the particles is specified either by the Drude (D) model with a size limited mean free path, or by the quantum mechanical derivation of Gor'kov and Éliashberg (GE). Excepting narrow diameter (x) and frequency ( $$\tilde v$$ ) intervals the absorption coefficients can be approximated by α=fCxγ $$\tilde v$$ δ, wheref is the filling factor (taken to be small),C is a constant which depends on the free electron parameters, andγ andδ are integers. Results for largerf′s are included also. The magnitudes ofC, γ andδ differ in general for the Drude and Gor'kov-Éliashberg theories; they are also different forx≶x C , wherex D C ≈5 nm andx GE C is typically 20 nm. The quantityx c signifies a transition from a range whereα is dominated by the dielectric polarisation to one where the magnetic polarisation is largest. An interesting multiple peak structure is found from detailed calculations ofα GE vs. $$\tilde v$$ for sufficiently small identical particles. Effects of log-normal size distributions are derived explicitely; any fine structure in theα GE vs.x functions is found to be completely washed out for practically attainable distribution widths.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01323666
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  • 6
    Electronic Resource
    Electronic Resource
    Search for superconductivity in vapour quenched alkaline earth metals and lanthanides (1976)
    Springer
    The European physical journal 25 (1976), S. 265-268 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Recent papers by Reale [1–3] report superconducting transitions in vapour quenched films of several alkali-, alkaline earth-, and rare earth metals which were not previously known to be superconducting. We report here a vain effort to verify that Mg, Ba, Ce, Pr, Nd or Yb are superconducting above 0.3 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01420888
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    Paper (German National Licenses)
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