期刊
PHYSICAL REVIEW B
卷 78, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.064515
关键词
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资金
- U.S. National Science Foundation [DMR-0756568]
- U.S. Department of Energy [DE-FG02-05ER46202]
- NSF of China
- Chinese Academy of Sciences
- Ministry of Science and Technology of China
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0756568] Funding Source: National Science Foundation
- U.S. Department of Energy (DOE) [DE-FG02-05ER46202] Funding Source: U.S. Department of Energy (DOE)
Polarized and unpolarized neutron-diffraction measurements have been carried out to investigate the iron magnetic order in undoped NdFeAsO. Antiferromagnetic order is observed below [4](6) K, which is in close proximity to the structural distortion observed in this material. The magnetic structure consists of chains of parallel spins that are arranged antiparallel between chains, which is the same in-plane spin arrangement as observed in all the other iron oxypnictide materials. Nearest-neighbor spins along the c axis are antiparallel like LaFeAsO. The ordered moment is 0.25(7) mu(B), which is the smallest moment found so far in these systems.
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