Indexed by: Journal paper

First Author: J. Dong

Correspondence Author: N. L. Wang,Z. Fang

Co-author: J. L. Luo,X. Dai,G. F. Chen,G. Li,W. Z. Hu,D. Wu,Z. Li,G. Xu,H. J. Zhang

Journal: Europhysics Letters

Included Journals: SCI

Discipline: 物理学

Document Type: J

Volume: 83

Issue: 2

Page Number: 27006

ISSN No.: 0295-5075

Key Words: 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(O1−xFx)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(O1−xFx)FeAs offers an exciting new system showing competing orders in layered compounds.

Date of Publication: 2008-06-27

Impact Factor: 2.203