HALL-EFFECT AND RESISTIVITY OF STAGE-2 SBCL5 INTERCALATED GRAPHITE

The Hall coefficient and the dc resistivity were measured in the basal plane of stage-2 SbCl5 intercalated graphite between 4.2 and 300 K. The Hall coefficient R(H) during the first cooling of a sample is 0.57 X 10(-8) m3 C-1 and is from the carriers in the two basic graphitic energy bands. R(H) is larger and has a maximum between 100 and 150 K in subsequent coolings. The change is attributed to the truncation of the basic Fermi surface by the periodicities of the in-plane intercalant structures. The resistivity at room temperature is (8+/-2) X 10(-5) OMEGA cm. It decreases as the temperature is lowered from the change in electron-phonon scattering. There is also a large decrease of resisitivity in a small temperature range during the first cooling of some samples. This is attributed to an initial change from disorder to order of the in-plane structure. The resistivity anisotropy is 1.6 X 10(4).