Abstract
New layered oxysulfides, Sr2CuFe1-xGaxO3S (x = 0, 0.05) and Sr4-xLaxCu2Mn3O7.5S2 (x = 0, 0.10, 0.20, 0.40) with alternating Cu2S2 and perovskite oxide layers were synthesized and characterized. The perovskite oxide layers in Sr2CuMO3S (M = Fe and Ga) and A4Cu2Mn3O7.5S2 (A = Sr and La) have stacking sequence with -MO2-SrO-SrO-MO2- and -MnO2-AO-MnO1.5-AO-MnO2-, respectively. Sr2CuFe1-xGaxO3S (x = 0, 0.05) is semiconducting. Theelectrical resistivity of the x = 0.05 sample is ten times lower than that of the x = 0 sample, indicating that the conduction path is in the Ga-introduced Fe oxide layer. Sr4Cu2Mn3O7.5S2 exihibits a phase transition from paramagnetic to antiferromagnetic states below 100 K. In Sr4-xLaxCu2Mn3O7.5S2 (x = 0, 0.10, 0.20, 0.40), the lattice parameters a and c decrease with increasing x. All samples are semiconducting. The electrical resistivity dramatically falls with increasing x; that of the x = 0.40 sample is one hundred times lower than that of the x = 0 sample.
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