Abstract
Results on the temperature and magnetic field dependence of the Hall effect in pregraphitic pyrocarbonbs heat treated between 1700°C and 2200°C are presented. The ex perimental data are discussed in terms of the two-carrier-minority and majority holes - model. It is shown that this model is able to reproduce all the set of experimental dat inn the low temperature range. Best fit calculations clearly show that minority carriers play a significant role, especially at low temperature. The temperature dependence of the low field Hall coefficient: R Ho originates from that of the minority holes mobility, while the field dependence of R H is due to the high mobility of those carriers. Hall effect measurements appear to be suited for investigating properties of high mobility minority carriers in disordered graphite.
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