Possibility of a metal-insulator transition at the Mott critical field in InSb and Hg1-xCdxTe.

Abstract

The rapid increase in the magnetoresistance that occurs near the Mott critical field in ${\mathrm{Hg}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{Cd}}_{\mathrm{x}}$Te and InSb has been reexamined using a simple picture of magnetic freeze-out on shallow, hydrogenic donors. The results indicate that the Mott critical field, as defined in the literature, does not mark the boundary between a metallic state and an insulating state.