ANOMALOUS MAGNETORESISTANCE OF FOLDED PURE AL-FOILS

Al foils, which were folded around an axis perpendicular to the curren t direction and the applied magnetic field, reveal an anomalous contri bution to the magnetoresistance superimposed on the intrinsic magnetor esistance of the non folded foil. This contribution consists of a line ar magnetoresistance term on only one side of the sample given by twic e the Hall resistance and an additional correction on both sample side s. By solving the transport problem of the folded geometry for an unco mpensated simple metal (e.g. Al), the experimental result can be under stood in detail in terms of current diversion near the fold in the sam ple. The linear magnetoresistance term is also found within the Buttik er edge-state transmission model for three-dimensional systems.