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- W1569427062 abstract "Superconducting tunneling measurements of the alloy system ${mathrm{Pb}}_{1ensuremath{-}2x}{mathrm{Tl}}_{x}{mathrm{Bi}}_{x}$ have been performed and a determination of the product function ${ensuremath{alpha}}^{2}(ensuremath{omega})F(ensuremath{omega})$ for these alloys is reported. It is found that with this system, Tl and Bi can be added at least up to $x=0.2$ before a change of phase from the fcc structure results. Because the electron concentration remains fixed at 4 e/at. throughout this phase, the electron-phonon coupling is not severely changed and the superconducting properties remain relatively unchanged. Associated with a gradual shift to lower energies of the phonon modes is a slight upward trend in the measured energy gap of the alloys. It is also found that with higher alloy concentrations there is a smearing of the fine structure in the product function ${ensuremath{alpha}}^{2}(ensuremath{omega})F(ensuremath{omega})$ and this is associated with finite lifetimes of the phonon modes resulting in energy uncertainties. In a simple quantitative fashion we have attempted to attribute these smearings to force-constant disorders between ions, and we obtain numbers for the deviations of interatomic force constants from their mean values." @default.
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- W1569427062 date "1969-11-15" @default.
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- W1569427062 title "Tunneling Determination of Phonon-Energy Uncertainties due to Force-Constant Disorders in the Alloy<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Pb</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mn>2</mml:mn><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Tl</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub…" @default.
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- W1569427062 doi "https://doi.org/10.1103/physrev.187.821" @default.
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