TEMPERATURE BREAKDOWN PHENOMENON IN TUNGSTEN SINGLE-CRYSTALS AT HIGH MAGNETIC-FIELDS

The transverse magnetoresistance and the Hall effect of tungsten singl e crystals with resistivity ratios of of up to 95000 were measured in the temperature range front 4.2 to 60 K and in magnetic, fields up to 15 T. It is shown thar anomalies of the galvanomagnetic properties app eal 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 magneto resistance 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. T he data allow us to conclude that the temperature breakdown effect, i. e. a fundamental change of the electron trajectories in high magnetic fields, rakes place irt tungsten single crystals under conditions of i ntersheet electron-phonon scattering.