Fermi surface ofUGe2in the paramagnetic phase

We measured the two-dimensional angular correlation of the positron annihilation radiation on a single crystal of ${\mathrm{UGe}}_2$ in the paramagnetic phase. The results of the Lock-Crisp-West transformation, yielding a projection of the electron-positron k density, are compared to band-structure calculations in local-density approximation treating the U $5f$ electrons as itinerant, fully localized or according to the assumption that two of the three 5f electrons are localized. The fully localized model shows the best agreement with the experiments.