Temperature breakdown phenomenon in tungsten single crystals at high magnetic fields

The transverse magnetoresistance and the Hall effect of tungsten single crystals with resistivity ratios of up to 95 000 were measured in the temperature range from 4.2 to 60 K and in magnetic, fields up to 15 T. It is shown that anomalies of the galvanomagnetic properties appear under strong intersheet electron-phonon scattering conditions. An exponential temperature dependence of the magnetoresistance (Peierls' exponent) is observed; the type of the field dependence of the magnetoresistance depends on the transport current direction in the crystal; the temperature behaviour of the Hall coefficient is determined by the type of the electron quasiorbits prevailing under these conditions. The data allow us to conclude that the temperature breakdown effect, i.e. a fundamental change of the electron trajectories in high magnetic fields, takes place in tungsten single crystals under conditions of intersheet electron-phonon scattering.