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Two-dimensional Cs-vacancy superstructure in iron-based superconductor

DOI: 10.1103/PhysRevB.91.144114 DOI Help

Authors: Daniel Porter (Diamond Light Source) , Eron Cemal (Royal Holloway, University of London) , David Voneshen (Royal Holloway, University of London) , Keith Refson (Rutherford Appleton Laboratory; University of London) , Matthias Gutmann (Rutherford Appleton Laboratory) , Alessandro Bombardi (Diamond Light Source) , Andrew Boothroyd (University of Oxford) , A. Krzton-maziopa (Warsaw University of Technology) , E. Pomjakushina (Paul Scherrer Institute) , K. Conder (Paul Scherrer Institute) , Jon Goff (Royal Holloway and Bedford New College)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 91 (14)

State: Published (Approved)
Published: April 2015
Diamond Proposal Number(s): 8686 , 10377

Abstract: Single crystal neutron diffraction is combined with synchrotron x-ray scattering to identify the different superlattice phases present in Cs0.8Fe1.6Se2. A combination of single crystal refinements and first principles modeling are used to provide structural solutions for the 5√×5√ and 2√×2√ superlattice phases. The 5√×5√ superlattice structure is predominantly composed of ordered Fe vacancies and Fe distortions, whereas the 2√×2√ 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 5√×5√ phase and a superconducting 2√×2√ phase.

Subject Areas: Physics


Instruments: I16-Materials and Magnetism