Kondo Effect in the Transport Properties of the CsCl‐Type Compounds Fe1−xTi1+x. I. Their Anomalous Behaviors in the Titanium‐Rich Compositions

A resistance minimum at 30 to 60 °K and a negative and giant valley of the thermoelectric power near 47 °K were observed in the CsCl‐type compounds, Fe 1−x Ti 1+x , with titanium‐rich compositions. This anomalous behavior of the transport phenomena, which are distinct from those of the stoichiometric compound showing an ordinary temperature dependence of the resistivity and a positive and monotonically increasing thermoelectric power, have features similar to the Kondo effect in dilute magnetic alloys. It is suggested that such anomalous phenomena may be caused by the existence of the iron atoms occupying the wrong atomic sites in a slightly disordered CsCl‐type lattice.