Fermi surface studies of type-II Dirac semimetal candidate NiTe₂ using de Haas-van Alphen oscillations

We have investigated the Fermi surface of the type-II Dirac semimetal candidate NiTe₂ using torque magnetometry. The torque signal measured under applied fields of 35 T and temperatures down to 0.32 K shows clear de Haas-van Alphen (dHvA) oscillations. The oscillations are well-defined and consist of two major frequencies F₁ ~ 100 T and F₂ ~ 400 T. To investigate the properties of the Fermi surface, we have carried out measurements of angular and temperature dependence of the dHvA oscillations. Both frequencies vary while increasing the angle between the sample surface and the magnetic field. Also, the amplitude of the oscillations decreases at higher temperatures. We have analyzed the temperature-dependent dHvA data using the Lifshitz-Kosevich theory and calculated several physical parameters characterizing the Fermi surface.