Hall effect and magnetoresistance in low dimensional magnetic systems

摘要

We have measured the Hall effect and magnetoresistance of stages 5 and 9 FeCl3hyphen;graphite intercalated compounds in a magnetic field up to 20 T and at several temperatures. Our preliminary results indicate that the Hall coefficient (RH) of stage 5 is positive at all field values and has insignificant variation between room and liquid helium temperature. In stage 9, however,RHhas a complicated field and temperature dependence. The magnetoresistance of the two stages at all temperature and field values is positive and stage 5 exhibits strong Shubinkovndash;de Haas oscillations at helium temperature. Fourier transforms of these oscillations are performed and the results indicate that stage 5 has a dominant fundamental frequency which is attributed to the hole carriers, whereas stage 9 exhibits a modulation of several frequencies which are related to different carrier pockets.