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The effects of pressure on the superconducting properties of a Bi-basedlayered superconductor La2O2Bi3Ag0.6Sn0.4S6, which possesses a four-layer-typeconducting layer, have been studied through the electrical resistance andmagnetic susceptibility measurements. The crystal structure under pressure wasexamined using synchrotron X-ray diffraction at SPring-8. In the low-pressureregime, bulk superconductivity with a transition temperature Tc of ~ 4.5 K wasinduced by pressure, which was achieved by in-plane chemical pressure effectowing to the compression of the tetragonal structure. In the high-pressureregime above 6.4 GPa, a structural symmetry lowering was observed, andsuperconducting transitions with a Tc ~ 8 K were observed. Our results suggestthe possible commonality on the factor essential for Tc in Bi-basedsuperconductors with two-layer-type and four-layer-type conducting layers.

High-pressure effects on superconducting properties and crystal structure of Bi-based layered superconductor La2O2Bi3Ag0.6Sn0.4S6