Superconductivity in a new layered bismuth oxyselenide: LaO0.5F0.5BiSe2

Abstract

We report superconductivity in a new layered bismuth oxyselenide LaO0.5F0.5BiSe2 with the ZrCuSiAs-type structure composed of alternating superconducting BiSe2 and blocking LaO layers. The superconducting transition temperature is TC = 2.6K, as revealed from DC magnetization, resistivity and muon spin rotation (muSR) experiments. DC magnetization measurements indicate a superconducting volume fraction of approximately 80%, which is at least twice higher in comparison to that found in corresponding sulphide LaO0.5F0.5BiS2. Importantly, the bulk character of superconductivity in LaO0.5F0.5BiSe2 was confirmed by muSR.

References in corpus (6)

• Superconductivity Appears in the Vicinity of an Insulating-Like Behavior in CeO${}_{1-x}$F${}_x$BiS${}_2$
• Superconductivity of F-substituted LnOBiS2 (Ln = La, Ce, Pr, Nd, Yb) compounds
• Ferroelectric Soft Phonons, Charge Density Wave Instability and Strong Electron-Phonon Coupling in BiS2-Layered Superconductors
• Structural Analysis and Superconducting Properties of F-Substituted NdOBiS2 Single Crystals
• Enhancement of superconductivity near the pressure-induced semiconductor-metal transition in BiS2-based compounds LnO(0.5)F(0.5)BiS2 (Ln = La, Ce, Pr, Nd)
• Insulator-to-Superconductor Transition upon Electron Doping in a BiS${}_2$-Based Superconductor Sr${}_{1-x}$La${}_x$FBiS${}_2$

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