Geometry and field dependence of the Fermi surface in TiBe2 studied with the DHVA effect in fields up to 35 T Ruitenbeek, J.M. van; Deursen, A.P.J. van; Schreurs, L.W.M.; Groot, R.A. de; Vroomen, A.R. de; Fisk, Z. Abstract. 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 r and an X-centred hole sheet. Both are split into a majorityspin ( T ) and a

more »

... minority-spin (I ) surface. In the field region studied A F = F , -F , amounts to about 200 T or lO"/o of the average frequency values. With the field direction parallel to [ 1 IO] the field dependence of the splitting of the r 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 r and X orbits show large enhancements of about I. = 3 and I .5 respectively. Stoner E C 1938