Anomalies of longitudinal magnetoresistivity in $n$-InSb

Ohmic $V_x$ and Hall $V_{Hy}$ potentials of InSb single crystals as functions of the angle $\alpha$ between the current $J_x$ and magnetic induction $B_{zx}$ directions at 60-350 K in magnetic fields of 0.1-20 kG have been studied. A sharp decrease in $V_x$ between the potential contacts at $\alpha$ close to 0 (180$^\circ$) have been observed in a number of samples with intrinsic and impurity $n$-type conductivity. The nature of the effect is discussed in terms of "growth" deviations from stoichiometry and by the low-resistance inclusions with $n$-type conductivity caused by them.