Abstract
The oscillatory magnetization of stage 1 and stage 2 AsF 5 intercalated graphite was studied with the de Haas-van Alphen effect in magnetic fields up to 22 T. Using the quasi-static torque method it was possible to determine the absolute value of the magnetization of sealed, chemically active samples. For the stagee 1 samples we found the expected frequency of ⋍ 1700 T , corresponding to the charge transfer of ⋍ 0.3 electron per AsF 5. From the angular dependence of the de Haas-van Alphen frequencies and the cyclotron effective masses we conclude that the Fermi surface is cylindrical. The Landau levels are well separated at 20 T compared with their broadening due to imperfections. The magnetization oscillations have sinusoidal shape with little higher harmonics, which indicates that the number of carriers in the graphite layers and the chemical potential are both field dependent.
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