Structural, Magnetic and Electronic Properties of the Iron-Chalcogenide A${}_x$Fe${}_{2-y}$Se${}_2$ (A=K, Cs, Rb, Tl and etc.) Superconductors

Abstract

The latest discovery of a new iron-chalcogenide superconductor A${}_x$Fe${}_{2-y}$Se${}_2$(A=K, Cs, Rb, Tl and etc.) has attracted much attention due to a number of its unique characteristics, such as the possible insulating state of the parent compound, the existence of Fe-vacancy and its ordering, a new form of magnetic structure and its interplay with superconductivity, and the peculiar electronic structures that are distinct from other Fe-based superconductors. In this paper, we present a brief review on the structural, magnetic and electronic properties of this new superconductor, with an emphasis on the electronic structure and superconducting gap. Issues and future perspectives are discussed at the end of the paper.

45 pages, 19 figures

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• The Unexpected Properties of Alkali Metal Iron Selenide Superconductors
• Common Electronic Origin of Superconductivity in (Li,Fe)OHFeSe Bulk Superconductor and Single-Layer FeSe/SrTiO3 Films
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• Phase relations in K_xFe_{2-y}Se_2 and the structure of superconducting K_xFe_2Se_2 via high-resolution synchrotron diffraction
• Enhancement of the superconducting gap by nesting in CaKFe4As4 - a new high temperature superconductor
• The intercalation chemistry of layered iron chalcogenide superconductors
• Microstructural analysis of phase separation in iron chalcogenide superconductors
• s${}_{\pm }$ pairing near a Lifshitz transition
• Macroscopic phase segregation in superconducting K0.73Fe1.67Se2 as seen by muon spin rotation and infrared spectroscopy
• High resolution characterisation of microstructural evolution in Rb${}_x$Fe${}_{2-y}$Se${}_2$ crystals on annealing
• Spin excitations in K${}_2$Fe${}_{4+x}$Se${}_5$: linear response approach
• Observation of a Phase Transition at 55 K in Single-Crystal CaCu1.7As2
• Optical study of the antiferromagnetic ordered state in electron-overdoped Ca0.77Nd0.23FeAs2
• LaO as a candidate substrate for realizing superconductivity in FeSe epitaxial film