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Basal plane resistivity of expanded graphite was studied under simultaneousinfluence of hydrostatic pressure up to 1.8 GPa and magnetic field 0.8 T in the77-300 K temperature region. Magnetic field induces negative magnetoresistancein the sample within all temperature and pressure range studied. A change inresistivity of the sample under maximum pressure reaches 80%. Significantchange in resistivity dependence on temperature under the pressure of 0.6 GPasuggests for ordering transition in the sample studied. Negativemagnetoresistance in the graphite reaches about 15% at 0.6 GPa. Magnetic fieldacts in the same way as pressure and potentiates the transition formation andfurther magnetoresistance dynamics. The effects observed are mostly of elasticcharacter according to resistivity of the unloaded sample.

Negative magnetoresistance dynamics in expanded graphite under hydrostatic pressure up to 1.8 GPa