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.

The de Haas-van Alphen effect has been observed in the hexaborides of La, Ce, Pr and Nd with the direction of the field parallel to [100]. The frequencies for the heavier rare-earth compounds are close to those for LaB6; large values for the mass compared to the ones in LaB6 and strong anisotropy of scattering has been observed. © 1982.

The DHVA effect in single crystals of TiBe2 has been investigated in magnetic fields between 10 and 35 T using a pulsed-field system. Two sheets of Fermi surface are found, an electron sheet around Gamma and an X-centred hole sheet. Both are split into a majority-spin ( to ) and a minority-spin ( down arrow ) surface. In the field region studied Delta F=F to-Fdown arrow amounts to about 200 T or 10% of the average frequency values. With the field direction parallel to (110) the field dependence of the splitting of the Gamma orbit is studied in detail. It is found that the difference in spin-up and spin-down Fermi surface areas is directly proportional to the magnetisation, within the experimental error. This is in agreement with the Stoner model. Departures from this model due to spin fluctuations are expected below 10 T. The effective masses of the Gamma and X orbits show large enhancements of about lambda =3 and 1.5 respectively.