Abstract
The angular dependent magnetoresistance oscillation (ADMRO) of the stage-2 IBr graphiteintercalation compound (GIC) was studied between 1.8 K and 110 K in magnetic fields between 1 and 9T. There was a series of peaks in the c-axis resistance as the field direction was changed from the c axisto the (001) plane. The field independence of the angular positions of the peaks, showing that theoscillation is not from the Shubnikov-de Haas effect, and the presence of the oscillation at hightemperatures indicate that the effect is semiclassic. The location and the relative amplitudes of the peaksshow that the ADMRO in this compound does not follow the predictions for the symmetrical corrugationmodel of the cylindrical Fermi surface. The reason is attributed to the presence of two cylindrical Fermisurfaces and zone folding of the Fermi surface by the periodicity of the IBr lattice in this compound.
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