Advanced Materials, Vol.27, No.17, 2715-2715, 2015
Room-Temperature Ba(Fe1-xCox)(2)As-2 is not Tetragonal: Direct Observation of Magnetoelastic Interactions in Pnictide Superconductors
Lattice distortions corresponding to Ba displacements with respect to the FeAs sublattice are revealed to break the room-temperature tetragonal symmetry in Ba(Fe1-xCox)(2)As-2. The displacements yield twin domains of the size of approximate to 10 nm. The domain size correlates with the magnitude of the local Fe magnetic moment and its non-monotonic dependence on Co concentration.