Digitale Medien
Springer
Journal of low temperature physics
70 (1988), S. 413-425
ISSN:
1573-7357
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Physik
Notizen:
Abstract Using two models for an anisotropic Coulomb pseudopotential parameter μ*(k), we have calculated approximate upper and lower limits for the anisotropic gap edge of superconducting aluminum as a function of wavevector direction over the Fermi surface. We consider all sources of anisotropy, i.e., anisotropic phonon dispersion curves and anisotropic Fermi surface, to determine the electron-phonon spectral functions α k 2 (ω)F k(ω) and the matrix elements of the screened Coulomb repulsion. We find values of the gap anisotropy parameter 〈a2〉 and of the ratio between the pure single-crystal and isotropic dirty limit critical temperatures that agree better with experimental results than the values found using a constant μ*. Disagreement between theory and experiment remains for the variation of Δo(k) itself over the Fermi surface.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00682789
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