Journal
PHYSICAL REVIEW B
Volume 78, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.054529
Keywords
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Funding
- U.S. NSF [DMR-0756568]
- U.S. DOE, Division of Materials Science, Basic Energy Sciences [DE-FG02-05ER46202]
- U.S. DOE, Division of Scientific User Facilities, Basic Energy Sciences
- NSF of China
- Chinese Academy of Sciences and the Ministry of Science and Technology of China
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0756568] Funding Source: National Science Foundation
- U.S. Department of Energy (DOE) [DE-FG02-05ER46202] Funding Source: U.S. Department of Energy (DOE)
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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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