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Fermi radii and velocities are determined by deconvoluting de Haas---van Alphen data. Comparison of these data with accurate augmented---plane-wave band-structure results establishes the reliability of the augmented---plane-wave calculations and allows a determination of the anisotropic many-body enhancement factor λ(→k). The Fermi-surface average 〈λ〉 of 1.33 suggests a large electron-electron contribution. Our anisotropic λ(k) provide a detailed test and guide for model calculations of many-body enhancement.
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Crabtree et al. (1979) studied this question.
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