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首页> 外文期刊>Physical review >Two-dimensional Cs-vacancy superstructure in iron-based superconductor Cs_(0.8)Fe_(1.6)Se_2
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Two-dimensional Cs-vacancy superstructure in iron-based superconductor Cs_(0.8)Fe_(1.6)Se_2

机译:铁基超导体Cs_(0.8)Fe_(1.6)Se_2中的二维Cs空位上层结构

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摘要

Single crystal neutron diffraction is combined with synchrotron x-ray scattering to identify the different superlattice phases present in Cs_(0.8)Fe_(1.6)Se_2- A combination of single crystal refinements and first principles modeling are used to provide structural solutions for the 5~(1/2) × 5~(1/2) and 2~(1/2) × 2~(1/2) superlattice phases. The 5~(1/2) × 5~(1/2) superlattice structure is predominantly composed of ordered Fe vacancies and Fe distortions, whereas the 2~(1/2) × 2~(1/2) 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~(1/2) × 5~(1/2) phase and a superconducting 2~(1/2) × 2~(1/2) phase.
机译:单晶中子衍射与同步加速器X射线散射相结合,以鉴定Cs_(0.8)Fe_(1.6)Se_2中存在的不同超晶格相。结合使用单晶细化和第一原理建模为5〜 (1/2)×5〜(1/2)和2〜(1/2)×2〜(1/2)超晶格相。 5〜(1/2)×5〜(1/2)超晶格结构主要由有序的Fe空位和Fe畸变组成,而2〜(1/2)×2〜(1/2)超晶格则由下令Cs空缺。 Cs的空位仅在平面内排序,从而在相互空间中造成布拉格杆。通过在样品表面上绘制具有狭窄空间分辨率的X射线衍射测量图,确定了结构畴图案,与大多数反铁磁5〜(1/2)×5〜(1/2)相和超导2〜(1/2)×2〜(1/2)相

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  • 来源
    《Physical review》 |2015年第14期|144114.1-144114.7|共7页
  • 作者单位

    Department of Physics, Royal Holloway, University of London, Egham, TW20 0EX, United Kingdom,Diamond Light Source Ltd, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, United Kingdom;

    Department of Physics, Royal Holloway, University of London, Egham, TW20 0EX, United Kingdom,Institut Laue-Langevin, BP156, F-38042 Grenoble Cedex 9, France;

    Department of Physics, Royal Holloway, University of London, Egham, TW20 0EX, United Kingdom;

    Department of Physics, Royal Holloway, University of London, Egham, TW20 0EX, United Kingdom,ISIS, Science and Technology Facilities Council, Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom;

    ISIS, Science and Technology Facilities Council, Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom;

    Diamond Light Source Ltd, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, United Kingdom;

    Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom;

    Faculty of Chemistry, Warsaw University of Technology, PL-00664 Warsaw, Poland;

    Laboratory for Developments and Methods, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland;

    Laboratory for Developments and Methods, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland;

    Department of Physics, Royal Holloway, University of London, Egham, TW20 0EX, United Kingdom;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    inorganic compounds;

    机译:无机化合物;

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