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 24.04.2008   Карта сайта     Language По-русски По-английски
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24.04.2008

2008; Accepted 8 April 2008; Published online 23 April 2008


Superconductivity at 43 K in an iron-based layered compound LaO1-xFxFeAs


Hiroki Takahashi1, Kazumi Igawa1, Kazunobu Arii1, Yoichi Kamihara2, Masahiro Hirano2,3 & Hideo Hosono2,3




  1. Department of Physics, College of Humanities and Sciences, Nihon University, Sakurajosui, Setagaya-ku, Tokyo 156-8550, Japan
  2. ERATO-SORST, JST, Frontier Research Center,
  3. Frontier Research Center, Tokyo Institute of Technology, 4259 Nagatsuda, Midori-ku, Yokohama 226-8503, Japan


Correspondence to: Hiroki Takahashi1 Correspondence and requests for materials should be addressed to H.T. (Email: hiroki@chs.nihon-u.ac.jp).





The iron- and nickel-based layered compounds LaOFeP (refs 1, 2) and LaONiP (ref. 3) have recently been reported to exhibit low-temperature superconducting phases with transition temperatures T c of 3 and 5 K, respectively. Furthermore, a large increase in the midpoint T c of up to approx26 K has been realized4 in the isocrystalline compound LaOFeAs on doping of fluoride ions at the O2- sites (LaO1-xFxFeAs). Experimental observations5, 6 and theoretical studies7, 8, 9 suggest that these transitions are related to a magnetic instability, as is the case for most superconductors based on transition metals. In the copper-based high-temperature superconductors, as well as in LaOFeAs, an increase in T c is often observed as a result of carrier doping in the two-dimensional electronic structure through ion substitution in the surrounding insulating layers, suggesting that the application of external pressure should further increase T c by enhancing charge transfer between the insulating and conducting layers. The effects of pressure on these iron oxypnictide superconductors may be more prominent than those in the copper-based systems, because the As ion has a greater electronic polarizability, owing to the covalency of the Fe–As chemical bond, and, thus, is more compressible than the divalent O2- ion. Here we report that increasing the pressure causes a steep increase in the onset T c of F-doped LaOFeAs, to a maximum of approx43 K at approx4 GPa. With the exception of the copper-based high-T c superconductors, this is the highest T c reported to date. The present result, together with the great freedom available in selecting the constituents of isocrystalline materials with the general formula LnOTMPn (Ln, Y or rare-earth metal; TM, transition metal; Pn, group-V, 'pnicogen', element), indicates that the layered iron oxypnictides are promising as a new material platform for further exploration of high-temperature superconductivity.



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  • Lichtenstain Alexandr Iosif  honorary member of ISSC science council

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  • Yakushev Mikhail Vasilii  honorary member of ISSC science council

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