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- W2016455142 abstract "The energy gap function in the Eliashberg formalism draws a spiral in the complex plane. A simple, efficient numerical scheme is devised to extend that spiral towards the bottom of the Fermi sea for lead, mercury, tin, and a model superconductor. The spiral is confirmed to converge to a constant value with a finite negative real part. The asymptotic behavior is explored to reveal a V-shaped dependence of the Coulomb pseudopotential ${ensuremath{mu}}^{*}$ on the electron cutoff frequency in Pb and Hg, with a strong growth tendency when the cutoff frequency is large. A reference formula due to Allen and Dynes correctly predicts the later growth trend of ${ensuremath{mu}}^{*}$ at large cutoff frequencies but overestimates its rate. Previous values of ${ensuremath{mu}}^{*}$ in the literature have to be viewed critically." @default.
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- W2016455142 date "2007-12-20" @default.
- W2016455142 modified "2023-09-25" @default.
- W2016455142 title "Asymptotic behavior of Eliashberg gap function in the complex plane and its implications for the Coulomb pseudopotential in superconductors" @default.
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- W2016455142 doi "https://doi.org/10.1103/physrevb.76.224520" @default.
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