Physics – Condensed Matter – Superconductivity
Scientific paper
2008-09-28
Phys. Rev. B 78 054529 (2008)
Physics
Condensed Matter
Superconductivity
reference updated
Scientific paper
10.1103/PhysRevB.78.054529
We use neutron scattering to study the structural distortion and antiferromagnetic (AFM) order in LaFeAsO$_{1-x}$F$_{x}$ 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.
Chen Guo-Feng
Dai Pengcheng
Huang Qingzhen
Luo Jian-Lin
Lynn Jacob W.
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