Magnetic order close to superconductivity in the iron-based layered LaO1-xF x FeAs systems

Clarina de la Cruz, Q. Huang, J. W. Lynn, Jiying Li, W. Ratcliff, J. L. Zarestky, H. A. Mook, G. F. Chen, J. L. Luo, N. L. Wang and Pengcheng Dai ()
Additional contact information
Clarina de la Cruz: The University of Tennessee, Knoxville, Tennessee 37996-1200, USA
Q. Huang: NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, USA
J. W. Lynn: NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, USA
Jiying Li: NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, USA
W. Ratcliff: NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, USA
J. L. Zarestky: Iowa State University, Ames, Iowa 50011, USA
H. A. Mook: Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
G. F. Chen: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences
J. L. Luo: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences
N. L. Wang: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences
Pengcheng Dai: The University of Tennessee, Knoxville, Tennessee 37996-1200, USA

Nature, 2008, vol. 453, issue 7197, 899-902

Abstract: Oxypnictide superconductors: Magnetic order Much like high-Tc copper oxides, superconductivity in the newly discovered the rare-earth iron-based oxide systems is derived from either electron or hole doping of their non-superconducting parent compounds. The parent LaOFeAs material is metallic but shows anomalies near 150 K in both resistivity and d.c. magnetic susceptibility. While optical conductivity and theoretical calculations suggest that LaOFeAs exhibits a spin-density-wave (SDW) instability that is suppressed by doping electrons to form superconductivity, there has been no direct evidence of SDW order. de la Cruz et al. report neutron-scattering experiments that demonstrate that LaOFeAs undergoes an abrupt structural distortion below ∼150 K, followed by the development of long-range SDW-type antiferromagnetic order at ∼137 K with a small moment but simple magnetic structure. Doping the system with fluorine suppresses both the magnetic order and structural distortion in favour of superconductivity. Therefore, like high-Tc copper oxides, the superconducting regime in these iron-based materials occurs in close proximity to a long-range ordered antiferromagnetic ground state.

Date: 2008
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DOI: 10.1038/nature07057

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