A scaling approach to the transverse magnetoresistance of kish graphite at 77 K Original Research Article

A scaling of magnetoresistance Δϱϱ0 was examined using Bϱ0 at liquid nitrogen temperature for kish graphite (KG) specimens with different values of residual resistivity ratio RRR between 3.92 and 35.6. The plots of Δϱϱ0 against Bϱ0 and the exponent n against Bϱ0 in Δϱϱ0 ∞ Bn varied systematically with RRR. The exponent n against Bϱ0 plots showed a minimum and maximum of n. The values of the minimum and maximum decrease with decreasing RRR, and the values of Bϱ0 at the minimum and the maximum approach each other with the decrease of RRR. The minimum and maximum seem to coincide for the specimen with lower RRR than 3.92. The saturation of n around n = 1 is found in the high Bϱ0 region only for the specimens with RRR < 8.