Volume 83, Number 2, July 2008
|Number of page(s)||4|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||27 June 2008|
Competing orders and spin-density-wave instability in La(OFx)FeAs
Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences - Beijing 100190, China
Accepted: 30 May 2008
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 Tc = 26 K in Fe-based oxypnictide La(OFx)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(OFx)FeAs offers an exciting new system showing competing orders in layered compounds.
PACS: 74.70.-b – Superconducting materials / 75.30.Fv – Spin-density waves / 74.25.Jb – Electronic structure
© EPLA, 2008
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