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  • 1
    Electronic Resource
    Electronic Resource
    Bohm trajectory and Feynman path approaches to the “Tunneling time problem” (1995)
    Springer
    Foundations of physics 25 (1995), S. 229-268 
    Details
    ISSN: 1572-9516
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A comparison is made between the Bohm trajectory and Feynman path approaches to the long-standing problem of determining the average lime taken for a particle described by the Schrödinger wave function ψ to tunnel through a potential barrier. The former approach follows simply and uniquely from the basic postulates of Bohm's causal interpretation of quantum mechanics; the latter is intimately related to the most frequently cited approaches based on conventional interpretations. Emphasis is given to the fact that fundamentally different transmission (T)-reflection (R) decompositions, particlelike and wavelike respectively, are central to the two methods: ¦ψ¦2=[¦ψ¦2]T+[¦ψ¦2]R (Bohm trajectory approach); ψ=ψT+ψR (Feynman path approach).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02055206
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Multiple-plane-wave theory of gap anisotropy in Al (1976)
    Springer
    Journal of low temperature physics 24 (1976), S. 25-34 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The variation over the Fermi surface of the superconducting gap edge Δ 0 (k) has been calculated for Al. We include in the computations a realistic Fermi surface, multiple-plane-wave electron-phonon matrix elements, and realistic phonons. The computations proceed from directional electron-phonon spectral weights which contain the information on the phonon-mediated electron-electron interaction for a given electron ¦k〉. To relate the microscopic parameters to the gaps, we use the equations due to Leavens and Carbotte. They are an approximate version of the Eliashberg equations valid for the gap edge in the weak coupling limit. The results are used to compute the pure single-crystal transition temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00659192
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    An important parameter in high-temperature superconductivity (1974)
    Springer
    Journal of low temperature physics 14 (1974), S. 195-211 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is widely held that the single most important parameter describing the strength of the electron-phonon interaction in superconductivity is the mass enhancement factor λ, and that the maximum possible transition temperature for a given class of materials (e.g., the polyvalent metals) is attained for a very large value, λ≈3, of the parameter. We show that it is not likely that the highest attainable values ofT c will reflect such large values of λ. Instead, we expect that they will be associated with values of λ that do not differ greatly from a value of about 1.5, and with very large values of the parameterA, whereA is the area under the electron-phonon interaction spectrum α2 F(v). This is certainly the case forNb 3 Sn, which has aT c of 18 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00654817
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    Paper (German National Licenses)
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