Abstract
We present a scaling theory to describe the magnetic-field-driven metal-insulator (MI) transition in Kondo insulators, in the case where both the insulating and metallic phases are nonmagnetic. Starting from the insulator the uniform magnetic field may drive the system continuously to a metallic state. The universality class of this MI transition is identified as that of density-driven transitions for which all critical exponents are known. At the critical field, where the metal-insulator transition occurs, the system presents non-Fermi liquid behavior and we determine its thermodynamic properties. In two dimensions there is a universal conductivity at the MI transition whose value is given. A functional integral approach is used to obtain results in $3d$ systems.
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