Abstract
A new model for the Fermi surface of LaB 6 is proposed. It consists of spherical balls at X points connected by the short necks, instead of the slender necks previously considered, and the small ellipsoid-electron-pockets which are elongated along the Σ axes and overlap on the necks. Angular variations of frequencies and intensities of the de Haas-van Alphen signals are calculated. Accumulated data including recent acoustic measurement are explained consistently. The model is obtained by displacing the unoccupied 4f levels upward from those of the self-consistent band calculation. This indicates the importance of the correction to the local density approximation for the 4f states.
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