On the Pressure Dependence of Electrical Conductivity of Graphite

概要

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Electrical conductivity (σ) of pyrolytic graphite along the basal was measured at room temperature in the presence of hydrostatic pressures (p) up to 20 kb. the pressure dependence coefficient d ln σ/dp evaluated was only order of 10^<-3>/kb, despite compressive stresses gave rise to a suppression of lattice vibrations, and also to an increase of the cerrier concentration (N) with a rate of d ln N/dp≳10^<-2>/kb. Such a discrepancy has successfully been removed by taking into account the pressure-induced change of the effective mass of carriers, which functions so as to cancel the increment of σ due to the increase of N. Calculations were performed on the basis of an effective mass approximation for the Slonczewski-Weiss band model. Thus, the participation of carrier-carrier scattering proposed by Yeoman and Young is excluded from responsible mechanisms. Discussions given of the c-axis conductivity on the same basis have also yielded a success in accounting for the pressure dependence.
社団法人日本物理学会の論文
1973-12-05