Abstract
The metal-non-metal transition in Kondo insulators of the type(Ce1-xLax)3Bi4Pt3 is studied as a function of theLa (Kondo hole) concentration x. We explore the transition undervariation of the applied magnetic field, the pressure, and thetemperature. The many-body effects are treated by diagonalizing thesite Hamiltonian and embedding this solution into the lattice, usingthe chain approximation. The alloy states at the Fermi energy areobtained using a real-space renormalization technique. Themetal-insulator transition produced by the incorporation of Laimpurities is explained by the appearance of a delocalized levelinside the conduction band rather than by the creation of animpurity band at the gap.
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