2008/03/24 by J. Dong, Jing Dong, Haijun Zhang +18 · 36 citations
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Magnetic and transport properties of perovskites and related materials #Rare-earth and actinide compounds #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1209/0295-5075/83/27006
published as Europhysics Letters, 83, 27006 (2008). · 4 pages, 4 figures
arxiv created 2008/03/24 · openalex publication_date 2008/06/27 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The interplay between different ordered phases, such as superconducting, charge or spin ordered phases, is of central interest in condensed-matter physics. The very recent discovery of superconductivity with a remarkable T <sub>c</sub>=26 K in Fe-based oxypnictide La(O<sub>1-x</sub>F<sub>x</sub>)FeAs (see Kamihara Y. et al., J. Am. Chem. Soc., 130 (2008) 3296) is a surprise to the scientific community and has generated tremendous interest. The pure LaOFeAs itself is not superconducting but shows an anomaly near 150 K in both resistivity and dc magnetic susceptibility. Here we provide combined experimental and theoretical evidences showing that a spin-density-wave (SDW) state develops at low temperature, in association with electron Nematic order. The electron-doping by F suppresses the SDW instability and induces the superconductivity. Therefore, the La(O<sub>1-x</sub>F<sub>x</sub>)FeAs offers an exciting new system showing competing orders in layered compounds.