期刊
PHYSICAL REVIEW B
卷 80, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.020504
关键词
antiferromagnetic materials; crystal structure; crystal symmetry; exchange interactions (electron); high-temperature superconductors; iron compounds; magnetic structure; neutron diffraction; sodium compounds; solid-state phase transformations
资金
- U.S. NSF [DMR-0756568]
- U.S. DOE BES [DE-FG02-05ER46202]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0756568] Funding Source: National Science Foundation
We use neutron scattering to study the spin and lattice structures of single crystal and powder samples of Na1-delta FeAs (T-c=23 K). Upon cooling from room temperature, the system goes through a series of phase transitions: first changing the crystal symmetry from tetragonal to orthorhombic at 49 K, then ordering antiferromagnetically with a spin structure similar to that of LaFeAsO and a small moment (0.09 +/- 0.04 mu(B)), and finally becoming superconducting below about 23 K. These results confirm that antiferromagnetic order is ubiquitous for the parent compounds of the iron arsenide superconductors and suggest that the separated structural and magnetic phase-transition temperatures are due to the reduction in the c-axis exchange coupling of the system.
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