Abstract
X-ray and muon spin-relaxation experiments performed on polycrystals confirm a sharp first-order transition at corresponding to an orthorhombic phase distortion and to a commensurate antiferromagnetic Fe ordering with a larger distortion and larger size of the ordered moment than reported for . The structural and the magnetic order parameters present a remarkable similarity in their temperature dependence from down to low temperatures, showing that both phenomena are intimately connected. Accordingly, the size of the ordered Fe moments scales with the lattice distortion when going from to . Full-potential band-structure calculations confirm that the columnar magnetic order with propagation vector (1,0,1) and the orthorhombic lattice distortion are intrinsically tied to each other.
- Received 4 July 2008
DOI:https://doi.org/10.1103/PhysRevB.78.180504
©2008 American Physical Society