Tetragonality induced superconductivity in anti-ThCr${}_2$Si${}_2$-type $R{E}_2$O${}_2$Bi ($RE$ = rare earth) with Bi square net

Abstract

We report a series of layered superconductors, anti-ThCr${}_2$Si${}_2$-type $R{E}_2$O${}_2$Bi ($RE$ = rare earth), composed of electrically conductive Bi square nets and magnetic insulating $R{E}_2$O${}_2$ layers. The superconductivity was induced by separating Bi square nets as a result of excess oxygen incorporation, irrespective of the presence of magnetic ordering in $R{E}_2$O${}_2$ layers. Intriguingly, the transition temperature of all $R{E}_2$O${}_2$Bi including nonmagnetic Y${}_2$O${}_2$Bi was approximately scaled by the unit cell tetragonality ($c$/$a$), implying a key role of relative separation of the Bi square nets to induce the superconductivity.

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Cited by in corpus (3)

• High electrical conduction of Sb square net in anti-ThCr${}_2$Si${}_2$ type La${}_2$O${}_2$Sb thin film grown by multilayer solid-phase epitaxy
• Increased hole mobility in anti-ThCr${}_2$Si${}_2$-type La${}_2$O${}_2$Bi co-sintered with alkaline earth metal oxides for oxygen intercalation and hole carrier doping
• Antiferromagnetic structure and magnetic properties of Dy2O2Te: An isostructural analog of the rare-earth superconductors R2O2Bi