Superconductivity at 43 K in SmFeAsO1-xF x

2008/03/29 by X. H. Chen, T. Wu, Tao Wu +6 · 1,706 citations
Business, Management and Accounting · Materials Science · Physics and Astronomy · #Condensed matter physics #Copper #Copper oxide #Corporate Taxation and Avoidance #Electrical resistivity and conductivity #Intellectual Capital and Performance Analysis #Iron-based superconductors research #Magnetic field #Magnetization #Materials science #Metallurgy #Oxide #Physics #Superconducting transition temperature #Superconductivity #Transition temperature #cond-mat.mtrl-sci #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1038/nature07045

published in Nature 453(7196), 761-762 (Nature Portfolio) · 8 pages, 4 figures

arxiv created 2008/03/29 · openalex publication_date 2008/05/25 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

Since the discovery of high-transition temperature (T_c) superconductivity in layered copper oxides, extensive efforts have been devoted to explore the higher T_c superconductivity. However, the T_c higher than 40 K can be obtained only in the copper oxide superconductors so far. The highest reported value of T_c for non-copper-oxide bulk superconductivity is 39 K in MgB₂.\citejun The T_c of about 40 K is close to or above the theoretical value predicted from BCS theory.\citemcmillan Therefore, it is very significant to search for non-copper oxide superconductor with the transition temperature higher than 40 K to understand the mechanism of high-T_c superconductivity. Here we report the discovery of bulk superconductivity in samarium-arsenide oxides SmFeAsO_1-xF_x with ZrCuAiAs type structure. Resistivity and magnetization measurements show strong evidences for transition temperature as high as 43 K. SmFeAsO_1-xF_x is the first non-copper oxide superconductor with T_c higher than 40 K. The T_c higher than 40 K may be a strong argument to consider SmFeAsO_1-xF_x as an unconventional superconductor.

Citations

• Transition Temperature of Strong-Coupled Superconductors

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