Extremal cross-sectional areas and effective masses of the Fermi surface in the (100) and (110) planes were measured using the de Haas-van Alphen effect. In addition, measurements of the field dependence of the magnetoresistance in the (100) plane were also performed which showed the existence of open orbits in certain directions and suggested the presence of magnetic breakdown. Much of the de Haas-van Alphen data were consistent with a set of nearly spherical ellipsoids located at the points X of the Brillouin zone and connected by necks which intersected the M line; magnetic breakdown across the necks was postulated in order to explain the remaining data. The proposed Fermi surface was consistent with discrete variational band-structure calculations.

De Haas-Van Alphen Effect and the Fermi Surface of LaB6. Arko, A.J., Crabtree, G., Karim, D., Mueller, F.M., Windmiller, L.R., Ketterson, J.B., Fisk, Z.: Physical Review B, 1976, 13[12], 5240-7