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Spin and Lattice Structure of Single Crystal SrFe2As2

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arxiv 0807.1077 v1 pith:ZLR4YUVO submitted 2008-07-07 cond-mat.str-el cond-mat.supr-con

Spin and Lattice Structure of Single Crystal SrFe2As2

Jun Zhao , W. Ratcliff II , J. W. Lynn , G. F. Chen , J. L. Luo , N. L. Wang , Jiangping Hu , Pengcheng Dai This is my paper
classification cond-mat.str-el cond-mat.supr-con
keywords srfe2as2structurelatticespina-axisantiferromagneticcompoundorthorhombic
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We use neutron scattering to study the spin and lattice structure on single crystals of SrFe2As2, the parent compound of the FeAs based superconductor (Sr,K)Fe2As2. We find that SrFe2As2 exhibits an abrupt structural phase transitions at 220K, 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 in SrFe2As2 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 elements) families of materials and on BaFe2As2, and therefore suggest that static antiferromagnetic order is ubiquitous for the parent compound of these FeAs-based high-transition temperature superconductors.

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