Abstract
The Dingle temperatures (Landau state lifetimes) have been determined from the Shubnikov-de Haas Effect at 1.2 K for three specimens of graphite as a function of the angle theta between H and c. For a single crystal which contains negative scattering centres, the lifetimes are almost independent of theta ( 40 degrees . In pyrolytic graphite, both lifetimes decrease steadily as theta is increased. These dependences are interpreted in terms of a trigonal fluting of the Fermi surfaces, which affects electrons more than holes. A preliminary estimate of stacking fault spacing in good quality pyrolytic graphite is given as approximately 1370 AA, and the influence of the mosaic structure of pyrolytic graphite on the measurements is briefly discussed.
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