ABSTRACT
Electrical properties of the layered oxysulfide (Lai1-xSrx)OCuS (0 ≤ x ≤ 0.07) were investigated. Electrical resistivity (ρ) measurements showed that the semiconductive behavior of (LaO)CuS was changed to metallic by the Sr substitution. The Sr substituted samples showed a first order phase transition, which is characterized by a jump of ρ at ∼320 K on heating and a drop at ∼200 K on cooling. Both Seebeck and Hall measurements showed that the Sr substituted samples are metals with holes as the dominant carriers below and above the transition temperature.
