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Here we report the superconductivity in the iron-based oxyarsenideSm[O1-xFx]FeAs, with the onset resistivity transition temperature at 55.0 K andMeissner transition at 54.6 K. This compound has the same crystal structure asLaOFeAs with shrunk crystal lattices, and becomes the superconductor with thehighest critical temperature among all materials besides copper oxides.

Superconductivity at 55 K in iron-based F-doped layered quaternary compound Sm[O1-xFx]FeAs