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Superconductivity in Niobium: Implications for Strong Coupling Superconductivity Theory
Abstract The microscopic parameters λ and μ* for high purity single crystal and polycrystalline Nb have been determined from superconductive tunneling junctions. These parameters are not in agreement with the strong coupling theory of superconductivity. This result is due to the fact that the associated electron-coupled phonon spectrum, α2F, agrees with the phonon density of states, F(ω), up to the longitudinal phonon peak but differs from F(ω) at higher energies. Manipulating the value of the energy gap of Nb to lower than the measured bulk value of 3.93 kBTc changes the result of the deconvolution significantly. Computer modeling studies of possible α2F spectra for Nb give μ*, λ values that agree with theoretical predictions only when α 2F has all the features of F(ω); otherwise negative values of μ* are necessary to explain the experimentally observed superconductivity of Nb.
Superconductivity in Niobium: Implications for Strong Coupling Superconductivity Theory
Abstract The microscopic parameters λ and μ* for high purity single crystal and polycrystalline Nb have been determined from superconductive tunneling junctions. These parameters are not in agreement with the strong coupling theory of superconductivity. This result is due to the fact that the associated electron-coupled phonon spectrum, α2F, agrees with the phonon density of states, F(ω), up to the longitudinal phonon peak but differs from F(ω) at higher energies. Manipulating the value of the energy gap of Nb to lower than the measured bulk value of 3.93 kBTc changes the result of the deconvolution significantly. Computer modeling studies of possible α2F spectra for Nb give μ*, λ values that agree with theoretical predictions only when α 2F has all the features of F(ω); otherwise negative values of μ* are necessary to explain the experimentally observed superconductivity of Nb.
Superconductivity in Niobium: Implications for Strong Coupling Superconductivity Theory
Bostock, J. (Autor:in) / Lo, K. H. (Autor:in) / Cheung, W. N. (Autor:in) / Diadiuk, V. (Autor:in) / MacVicar, M. L. A. (Autor:in)
01.01.1976
14 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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