Superconductivity in the iron selenide KxFe2Se2 (0 <= x <= 1)

Abstract

We report the superconductivity at above 30 K in a new FeSe-layer compound K0.8Fe2Se2 (nominal composition) achieved by metal K intercalating in between FeSe layers. It is isostructural to BaFe2As2 and possesses the highest Tc for FeSe-layer materials so far under ambient pressure. Hall effect indicates the carriers are dominated by electron in this superconductor. We confirm that the observed superconductivity at above 30 K is due to this new FeSe-based 122 phase. Our results demonstrate that FeSe-layer materials are really remarkable superconductors via structure and carrier modulation.

18 pages,5 figures

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• Enhancement of superconducting transition temperature of FeSe by intercalation of a molecular spacer layer
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• The intercalation chemistry of layered iron chalcogenide superconductors
• Hydrostatic pressure: A very effective approach to significantly enhance critical current density in granular Sr4V2O6Fe2As2 superconductor
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• Electric double-layer transistor using layered iron selenide Mott insulator TlFe1.6Se2
• Electronic band structure and Fermi surface for new layered superconductor LaO0.5F0.5BiS2 in comparison with parent phase LaOBiS2 from first principles
• High resolution characterisation of microstructural evolution in Rb${}_x$Fe${}_{2-y}$Se${}_2$ crystals on annealing
• Formation of the density wave energy gap in Na${}_2$Ti${}_2$Sb${}_2$O: an optical spectroscopy study
• Phase co-existence and structured diffuse scattering seen by X-ray 3D mapping of reciprocal space for Cs0.8Fe1.6Se2
• Elastic properties and inter-atomic bonding in new superconductor KFe2Se2 from first principles calculations
• Pressure Driven Phase Transition in 1T-TiSe${}_2$ , a MOIPT+DMFT Study
• The Superconducting Transition Temperatures of Fe1+xSe1--y, Fe1+xSe1--yTey and (K/Rb/Cs)zFe2--xSe2
• Magnetic-field tuned anisotropy in superconducting Rb(x)Fe(2-y)Se(2)
• Electronic properties and Fermi surface for new Fe-free layered superconductor BaTi2Bi2O from first principles
• Origin of pressure induced second superconducting dome in AyFe2-xSe2 [A=K, (Tl,Rb)]
• Trends in structural, electronic properties, Fermi surface topology, and inter-atomic bonding in the series of ternary layered dichalcogenides KNi2S2, KNi2Se2, and KNi2Te2 from first principles calculations