Two-dimensional electron gas at GaAs/AlGaAs heterointerface subjected to a
lateral magnetic superlattice exhibits a T-2-dependent excess resistivity,
which is attributed to electron-electron umklapp scattering. The current de
nsity dependence of the excess resistivity proves that the phenomenon is go
verned by the electron temperature. The umklapp scattering gives rise to a
transverse component of resistivity in the case of an oblique lateral super
lattice. (C) 2000 Elsevier Science B.V. All rights reserved.