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Superconductivity at 43 K in SmFeAsO1-xFx

TypeWhite Paper Summary

Since the discovery of high-transition-temperature (high-T c) superconductivity in layered copper oxides, extensive effort has been devoted to exploring the origins of this phenomenon. A T c higher than 40 K (about the theoretical maximum predicted from Bardeen–Cooper–Schrieffer theory1), however, has been obtained only in the copper oxide superconductors. The highest reported value for non-copper-oxide bulk superconductivity is T c = 39 K in MgB2 (ref. 2). The layered rare-earth metal oxypnictides LnOFeAs (where Ln is La–Nd, Sm and Gd) are now attracting attention following the discovery of superconductivity at 26 K in the iron-based LaO1-xFxFeAs (ref. 3). Here we report the discovery of bulk superconductivity in the related compound SmFeAsO1-xFx, which has a ZrCuSiAs-type structure. Resistivity and magnetization measurements reveal a transition temperature as high as 43 K. This provides a new material base for studying the origin of high-temperature superconductivity.

Keywords
Authors
Name:Pierre François LENNE
Name:Ross J. Metzger
Name:Mark A. Krasnow
Name:Gail R. Martin
Name:Thomas Lecuit
Name:Carl D Murray
Name:Seung Woo Kim
Name:X H Chen
Organizations
Organization:Stanford University

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