THE FERMI-SURFACE OF CEB6

The heavy-fermion compound CeB6 has been studied using the fully relat ivistic spin-polarized mean muffin-tin orbital method within the local density approximation. Two separate calculations, one where the f ele ctron is treated as a valence electron and the other where it is treat ed as part of the core, have been performed and the Fermi surface is o btained. The angular-dependent de Haas-van Alphen (dHvA) frequencies a re calculated in both cases and they are compared with the experimenta l dHvA frequencies. We also calculated the electron momentum densities and compared them with the electron-positron momentum densities measu red from the two-dimensional angular correlation of electron-positron annihilation radiation. The spin polarization of the Fermi surface is analysed and we present a new interpretation of the experimental data of Harrison ei al.