ELECTROCONDUCTIVITY AND ELECTRON-SCATTERING MECHANISMS IN ULTRA-PURE COMPENSATED METALS AT HIGH MAGNETIC-FIELDS

The transverse magnetoresistivity of tungsten, molybdenum and rhenium single crystals with resistivity ratios of up to 80.000 were measured in the temperature range from 4.2 to 50 K in magnetic fields up to 15 T. We show that four main scattering mechanisms of the conduction elec trons in pure crystals of compensated metals exist at high magnetic fi elds: electron-surface scattering, inter- and intrasheet electron-phon on scattering, and ''electron-phonon-surface'' scattering. The data al low us to explain some of the anomalies, which occur in the high-field magnetoconductivity of metals.