Phys. Rev. B 78, 054529 (2008) [6 pages]Doping evolution of antiferromagnetic order and structural distortion in LaFeAsO1−xFxReceived 17 July 2008; revised 26 July 2008; published 28 August 2008 We use neutron scattering to study the structural distortion and antiferromagnetic (AFM) order in LaFeAsO1−xFx as the system is doped with fluorine (F) to induce superconductivity. In the undoped state, LaFeAsO exhibits a structural distortion, changing the symmetry from tetragonal (space group P4/nmm) to orthorhombic (space group Cmma) at 155 K, and then followed by an AFM order at 137 K. Doping the system with F gradually decreases the structural distortion temperature, but suppresses the long range AFM order before the emergence of superconductivity. Therefore, while superconductivity in these Fe oxypnictides can survive in either the tetragonal or the orthorhombic crystal structure, it competes directly with static AFM order. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.78.054529
DOI:
10.1103/PhysRevB.78.054529
PACS:
75.25.+z, 75.50.Ee, 25.40.Dn, 75.30.Fv
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