Magnetic-field dependence of the normal electron-electron scattering resistivity

An analysis is presented of the magnetic-field dependence of the normal electron-electron scattering contribution to the electrical resistivity of the simple metals. It is shown that a magnetic field tends to 'wash out' the anisotropy of the electron relaxation time that characterises a strained sample and thus suppresses the contribution of normal electron-electron scattering. An explicit calculation is carried out and it is found that for a strained sample of Cu, a magnetic field of only 10-15 kG is sufficient to reduce the electron-electron scattering resistivity by a factor of about two.