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

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.

preprint2013arXivOpen access
A. Krzton-MaziopaZ. GuguchiaE. PomjakushinaV. PomjakushinR. KhasanovH. LuetkensP. K. BiswasA. AmatoH. KellerK. Conder
cond-mat.supr-con
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A. Krzton-MaziopaZ. GuguchiaE. PomjakushinaV. PomjakushinR. KhasanovH. LuetkensP. K. BiswasA. AmatoH. KellerK. Conder

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