  For a single crystal of TmGa3, two-dimensional angular correlation of
positron annihilation radiation spectra were measured and subjected to a
deconvolution algorithm based on the Van Citter iterative method. The
three-dimensional electron-positron momentum density was reconstructed both via
the Cormack and a modified Fourier-transform-based method. After the 3D LCW
transformation, the resulting k-space density was in fair agreement with band
structure LMTO calculations. In particular, the use of deconvoluted data helped
to reveal small details of the Fermi surface in the 6th band.

Materials Science