Microstructure and Fe-vacancy ordering in the KFexSe2 superconducting system

Abstract

Structural investigations by means of transmission electron microscopy (TEM) on KFexSe2 with 1.5 \leq x \leq 1.8 have revealed a rich variety of microstructure phenomena, the KFe1.5Se2 crystal often shows a superstructure modulation along the [310] zone-axis direction, this superstructure can be well interpreted by the Fe-vacancy order within the a-b plane. Increase of Fe-concentration in the KFexSe2 materials could not only result in the appearance of superconductivity but also yield clear alternations of microstructure. Structural inhomogeneity, the complex superstructures and defect structures in the superconducting KFe1.8Se2 sample have been investigated based on the high-resolution TEM.

13 pages, 4 figures

References in corpus (12)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Superconductivity up to 37 K in (A1-xSrx)Fe2As2 with A=K and Cs
• Superconductivity at 32 K in single crystal Rb${}_{0.78}$Fe${}_2$Se${}_{1.78}$}
• Synthesis and crystal growth of Cs0.8(FeSe0.98)2: a new iron-based superconductor with Tc=27K
• The effect of varying Fe-content on transport properties of K intercalated iron selenide KxFe2-ySe2
• Transport properties of the new Fe-based superconductor KxFe2Se2 (Tc = 33 K)
• Superconductivity and phase diagrams in 4d- and 5d-metal-doped iron arsenides SrFe_{2-x}M_xAs_2 (M = Rh, Ir, Pd)
• Tailoring the Superconductivity and Antiferromagnetic Order in SrFe2-xRhxAs2
• Superconductivity induced by doping Pd in SrFe2-xPdxAs2
• Superconductivity at 22.3 K in SrFe2-xIrxAs2
• Electronic structures and magnetic orders of Fe-vacancies ordered ternary iron selenides TlFe${}_{1.5}$Se${}_2$ and AFe${}_{1.5}$Se${}_2$ (A=K, Rb, or Cs)
• Structural features and tetragonal-orthorhombic phase transition in SrFe2As2 and CaFe2As2

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