Undoped and doped FeSi or how to make a heavy fermion metal with three of the most common elements

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We review electrical conductivity, magnetic susceptibility and optical data on the Kondo insulator FeSi and its chemically doped metallic derivatives. While at T = 0, FeSi appears in many respects to be a conventional band insulator, its temperature-dependent behavior cannot be explained in terms of ordinary band theory. Doping with Al yields a transition from the Kondo insulator to a heavy fermion metal. The transition maps quantitatively onto that observed for Si:P, with the exception of a strongly renormalized effective carrier mass and critical concentration. We conclude that one of the simplest ways to make a heavy fermion metal is to dope a Kondo insulator.

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Materials Science and Engineering B: Solid-State Materials for Advanced Technology

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