TORQUE MEASUREMENTS ON NBSE2

The Fermi surface of 2H-NbSe2 has been investigated using the torque m ethod in strong magnetic fields up to 27 T and at temperatures down to 0.4 K. We show that using the torque method it was possible to observ e oscillations at orientations below Theta less than or equal to 15 de grees (Theta is the angle between the c-axis and the magnetic field). The lateral extent of the pan cake Fermi surface results larger as com pared to previous estimations. Measurements at orientations 34 degrees less than or equal to Theta less than or equal to 55 degrees show cle arly the existence of a spin zero at Theta = 43 degrees. From this pos sible values of the effective g-factor could be deduced.