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Superconductivity and phase diagram in iron-based arsenic-oxides ReFeAsO <sub>1−δ</sub> (Re = rare-earth metal) without fluorine doping
Europhysics Letters (EPL) · 2008 · Vol. 83(1) · pp. 17002–17002
Zhi‐An Ren✉(Czech Academy of Sciences, Institute of Physics)Guangcan Che(National Laboratory for Superconductivity)Xiaoli Dong(Chinese Academy of Sciences)Jie Yang(National Laboratory for Superconductivity)Wei Lu(National Laboratory for Superconductivity)Wei Yi(Czech Academy of Sciences, Institute of Physics)Xiaoli Shen(Czech Academy of Sciences, Institute of Physics)Zhengcai Li(Czech Academy of Sciences, Institute of Physics)Liling Sun(Czech Academy of Sciences, Institute of Physics)Fang Zhou(National Laboratory for Superconductivity)Zhongxian Zhao(Czech Academy of Sciences, Institute of Physics)
Abstract
Here we report a new class of superconductors prepared by high pressure synthesis in the quaternary family ReFeAsO1-delta (Re = Sm, Nd, Pr, Ce, La) without fluorine doping. The onset superconducting critical temperature (Tc) in these compounds increases with the reduction of Re atom size, and the highest Tc obtained so far is 55 K in SmFeAsO1-delta. For the NdFeAsO1-delta system with different oxygen concentration a dome-shaped phase diagram was found.
Iron-based superconductors researchRare-earth and actinide compoundsPhysics of Superconductivity and MagnetismSuperconductivityPhase diagramFluorineDopingMaterials scienceMetalPhase (matter)ArsenicRare earthInorganic chemistry
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References
Iron-Based Layered Superconductor La[O<sub>1-</sub><i><sub>x</sub></i>F<i><sub>x</sub></i>]FeAs (<i>x</i> = 0.05−0.12) with <i>T</i><sub>c</sub> = 26 K
Journal of the American Chemical Society · 2008 · 7,756 citations
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