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We report synthesis, characterization, and physical properties of layeredbismuth-sulfide compounds La2O2Bi3-xPb1+xS6. We synthesized a new La2O2Bi3PbS6compound, whose crystal structure is similar to those of the La2O2Bi3AgS6superconductor or La2O2Bi2Pb2S6 (insulator) with a four-layer-type conductinglayer. The crystal structure of La2O2Bi3PbS6 is characterized in a tetragonalP4/nmm space group, and the lattice parameters are a = 4.084(1) {\AA} and c =19.71(2) {\AA}. The obtained La2O2Bi3PbS6 sample exhibits narrow gapsemiconductor (metallic-like) transport behavior with an anomaly near the 160K. A metallic-like to insulator transition has been observed through Pbsubstitution, with increasing x in La2O2Bi3-xPb1+xS6. Furthermore, we appliedexternal pressure for x = 0 and observed pressure-induced superconductivity.The onset of superconductivity appeared at 0.93 GPa, and the highest transitiontemperature was 3.1 K at 2.21 GPa.

Evaluation of insulating behavior by Pb Substitution and Pressure-Induced Superconductivity in La2O2Bi3-xPb1+xS6