Investigation of the electron energy spectrum graphite interstitial compounds of low-grade acceptor type

The oscillatory and galvomagnetic effects and electrical conductivities of a number of low-grade acceptor type graphite interstitial compound (GIC) are investigated. The energy spectrum parameters, concentrations, effective masses, current-carrier mean free paths, and the character of the energy spectrum variation under hydrostatic pressure are determined. In GIC iodine monochloride, the pressure leads to a change in intercalation grade. Characteristics of GIC conductivity are studied in the region of order-disorder phase transitions in the interstitial-material layers. For the case of GIC iodine monochloride, it is shown that 'supermetallic' conductivity at room temperature is associated with a high density of holes and their long mean free paths due to the two-dimensional character of the charge transfer phenomenon.