Abstract
Single crystal neutron diffraction is combined with synchrotron x-ray scattering to identify the different superlattice phases present in . A combination of single crystal refinements and first principles modeling are used to provide structural solutions for the and superlattice phases. The superlattice structure is predominantly composed of ordered Fe vacancies and Fe distortions, whereas the superlattice is composed of ordered Cs vacancies. The Cs vacancies only order within the plane, causing Bragg rods in reciprocal space. By mapping x-ray diffraction measurements with narrow spatial resolution over the surface of the sample, the structural domain pattern was determined, consistent with the notion of a majority antiferromagnetic phase and a superconducting phase.
- Received 12 March 2015
- Revised 14 April 2015
DOI:https://doi.org/10.1103/PhysRevB.91.144114
©2015 American Physical Society