Electrical Properties of Quasi-One-Dimensional Compound KFe(S1-xSex)2

Abstract
Electrical resistivity measurements have been made on KFe(S1-x Se x )2 (0≤x≤0.90) single crystals. The value along the c-axis is on the order of 105 Ω·cm for x=0 at 320 K. All samples exhibit semiconductive dependence on temperature with a large anomaly around room temperature. The substitution of selenium for sulfur causes decrease in both resistivity and activation energy. The susceptibility of the KFe(S0.74Se0.26)2 single crystal shows paramagnetic behaviour with weak temperature dependence without an anomaly. This indicates the existence of a metallic chain in this series of compounds.