Journal
PHYSICAL REVIEW B
Volume 78, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.140504
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Funding
- U.S. National Science Foundation [DMR-0756568]
- DOE [DEFG02-05ER46202]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0756568] Funding Source: National Science Foundation
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We use neutron scattering to study the spin and lattice structure of single-crystal SrFe2As2, the parent compound of the FeAs-based superconductor (Sr,K)Fe2As2. We find that SrFe2As2 exhibits an abrupt structural phase transition at 220 K, where the structure changes from tetragonal with lattice parameters c>a=b to orthorhombic with c>a>b. At almost the same temperature, Fe spins develop a collinear antiferromagnetic structure along the orthorhombic a axis with spin direction parallel to this a axis. These results are consistent with earlier work on the RFeAsO (R=rare earth) families of materials and on BaFe2As2, and therefore suggest that static antiferromagnetic order is ubiquitous for the parent compounds of these FeAs-based high-transition temperature superconductors.
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