Doping evolution of antiferromagnetic order and structural distortion in LaFeAsO1-xFx

Huang  Q; Zhao  J; Lynn  JWChen  GFLuo  JLWang  NLDai  PC

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Doping evolution of antiferromagnetic order and structural distortion in LaFeAsO1-xFx

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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.

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《Physical review, B. Condensed matter and materials physics》 |2008年第5期|054529-1-054529-6-0|共6页
作者
Huang Q; Zhao J; Lynn JWChen GFLuo JLWang NLDai PC;
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作者单位

Natl Inst Stand & Technol, NIST Ctr Neutron Res, Gaithersburg, MD 20899 USA;

Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Inst Phys, Beijing 100080, Peoples R China;

Oak Ridge Natl Lab, Neutron Scattering Sci Div, Oak Ridge, TN 37831 USAUniv Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA;

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正文语种英语
中图分类固体物理学;
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SUPERCONDUCTIVITY;

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Doping evolution of antiferromagnetic order and structural distortion in LaFeAsO1-xFx

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