Abstract
The three dimensional electron-positron momentum density in niobium has been reconstructed from measurements of two dimensional angular correlation of positron annihilation radiations (2D-ACAR) followed by the image reconstruction technique based on a direct Fourier transformation. We determined the position of the Fermi surface sheets; Γ-centered hole octahedron, multiply connected jungle-gym arms and N -centered hole ellipsoids. The Fermi surface topology is in good agreement with the theory.
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