Fermi surfaces and effective masses in LnB6, Ln La, Ce and Pr

The Fermi surface has been compared for the three compounds LnB6 (Ln La, Ce and Pr) by measurement of the de Haas-van Alphen effect. The major part is observed to be similar in each compound, most likely consisting of X-centred ellipsoids with a total effective volume of about 1 electron per formula unit. Differences occur in the details of the shape of the FS, clearly seen for PrB6. Large effective masses, m*, are observed for CeB6 and PrB6, m* = 6 and about 1.8, respectively. These have to be compared with m* = 6.0 for LaB6. © 1985