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In addition to higher Tc compared with the ubiquitous cuprates for a materialcomposed of a single electronically active layer, the newly discovered LnFeAsOsuperconductors offer additional compositional variation. In a similar fashionto the CuO2 layers in cuprates, the FeAs layers now dominate the electronicstates that produce superconductivity. Cuprate superconductors distinguishthemselves structurally by adopting different stacking of the Cu-O andelectronically inactive "spacer" layers. Using the same structural philosophy,materials with the formula (A,K)Fe2As2,A=Ba or Sr have been reported andpossess a Tc~38 K. Here, we report the neutron diffraction studies of BaFe2As2that shows, in contrast to previous studies on the LnFeAsO materials, anantiferromagnetic transition which concurs with first-order structuraltransition. Although the magnetic and structural transitions occur differentlyin the AFe2As2 and LnFeAsO-type materials, this work clearly demonstrates thatthe complete evolution to a low symmetry structure is a pre-requirement for themagnetic order.

Magnetic order in BaFe2As2, the parent compound of the FeAs based superconductors in a new structural family