Abstract
The temperature dependence of the Hall coefficient in the interval 1.8–300 K is investigated in detail in high-quality single-crystal samples of a Kondo insulator — iron monosilicide. It is established that the parameter R H (T,H=12.5 kOe) changes sign twice in the temperature interval employed, and at temperatures below T m ≈7 K an anomalous (magnetic) component appears in the angular and field dependences of the Hall voltage. The results of the experimental investigations of R H (T,H 0 ) in FeSi are discussed on the basis of the phase diagram in the model of an excitonic insulator.
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