EXPERIMENTAL-VERIFICATION AND QUANTITATIVE-ANALYSIS OF THE TEMPERATURE (PHONON) BREAKDOWN PHENOMENON IN THE HIGH-FIELD MAGNETORESISTIVITY OF COMPENSATED METALS

The transverse magnetoresistivity of tungsten single crystals with res istivity ratios of up to 80.000 was measured in the temperature range from 4.2 to 60 K and in magnetic fields up to 15 T. The experiments sh ow that the temperature (phonon) breakdown effect occurs in compensate d metals as a result of strong electron-phonon scattering. This lends to a transformation of closed electron orbits into quasi-open ones and consequently, to anomalies of the galvanomagnetic properties. A large anisotropy of the magnetoresistivity (up To 83 %), i.e. a dependence of resistivity on current direction, is observed in a cubic crystal. T he power index n in? the field dependence of the magnetoresistivity de creases and the characteristic intersheet gap temperatures T-0, which are determined fr om an exponential temperature dependence of the magn etoresistivity, ''formally'' deperzd on magnetic field. A detailed ana lysis of the experimental results allows us to explain all these anoma lies by the temperature breakdown effect and to obtain new information on this phenomenon in metals at high magnetic fields.