Abstract
LaO1−xBiSSe polycrystalline samples were successfully synthesized by conventional solid-state reaction method. The effects of oxygen vacancies on the crystal structure, magnetic properties under atmospheric and high pressure, and electrical property of LaOBiSSe were investigated. Polycrystalline samples LaO1−xBiSSe with x = 0–0.1 were well indexed to the tetragonal CeOBiS2-type structure with the space group P4/nmm. With increasing oxygen vacancy content, the crystal lattice contracted significantly along the c-axis, the semiconductor behavior was suppressed, and the metal-semiconductor transition temperature decreased, which is a necessary prerequisite for superconductivity in BiCh2-based (Ch = S and Se) system. However, oxygen vacancy level introduced in this work is insufficient to further contract the crystal lattice and increase carrier density. Even though external pressure (~ 1 GPa) was applied, no superconducting transition corresponding to LaO1−xBiSSe appeared except for that of manometer Pb. The reasons for the absence of superconductivity in LaO1−xBiSSe system were discussed.
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