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

TL;DR

This paper reports the discovery of superconductivity at 55 K in a fluorine-doped iron-based compound Sm[O1-xFx]FeAs, marking a significant advancement in high-temperature superconductors.

Contribution

It introduces a new iron-based superconductor with the highest critical temperature among non-copper oxide materials, expanding the understanding of high-temperature superconductivity.

Findings

Superconductivity at 55 K in Sm[O1-xFx]FeAs.

Same crystal structure as LaOFeAs with smaller lattice parameters.

Highest T_c among non-copper oxide superconductors.

Abstract

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