Block Antiferromagnetism and Checkerboard Charge Ordering in Alkali-doped Iron Selenides $R$${}_{1-x}$Fe${}_{2-y}$Se${}_2$

Abstract

By performing first-principles electronic structure calculations and analyzing effective magnetic model of alkali-doped iron selenides, we show that the materials without iron vacancies should approach a novel checkerboard phase in which each four Fe sites group together in tetragonal structure. The checkerboard phase is the ground state with a block antiferromagnetic (AFM) order and a small charge density wave order in the absence of superconductivity. Both of them can also coexist with superconductivity. The results explain mysterious $2\times 2$ ordered patterns and hidden orders observed in various different experiments, clarify the missing link between AFM and superconducting phases, suggest that the block-AFM state is the parent state, and unify the understanding of various observed phases in alkali-doped iron selenides.

5 pages

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Cited by in corpus (22)

• The Unexpected Properties of Alkali Metal Iron Selenide Superconductors
• KFe_2Se_2 is the parent compound of K-doped iron selenide superconductors
• BaFe${}_2$Se${}_3$: a high $T_{\mathrm{C}}$ magnetic multiferroic with large ferrielectric polarization
• Reciprocal-space structure and dispersion of the magnetic resonant mode in the superconducting phase of Rb(x)Fe(2-y)Se2 single crystals
• Exotic magnetic order in the orbital-selective Mott regime of multiorbital systems
• Pressure-driven phase transition from antiferromagnetic semiconductor to nonmagnetic metal in two-leg ladders $A$Fe${}_2$$X$${}_3$ ($A$=Ba or K, $X$=S or Se)
• Magnetic Phase Diagram of a Five-Orbital Hubbard Model in the Real-Space Hartree Fock Approximation Varying the Electronic Density
• Strain-engineered A-type antiferromagnetic order in YTiO${}_3$: a first-principles calculation
• Charge order driven by multiple-Q spin fluctuations in heavily electron-doped iron selenide superconductors
• Phase diagram of doped BaFe${}_2$As${}_2$ superconductor under broken $C_4$ symmetry
• Direct Visualization of Irreducible Ferrielectricity in Crystals
• Synthesis, Structural, and Transport Properties of Cr-doped BaTi_2As_2O
• Electronic and Magnetic Structures of Chain Structured Iron Selenide Compounds
• Two-dimensional Cs-vacancy superstructure in iron-based superconductor $C{s}_{0.8}F{e}_{1.6}S{e}_2$
• New iron-based multiferroics with improper ferroelectricity
• First Principles Study of the Magnetic Properties of LaOMnAs
• Intrinsic high-temperature superconductivity in ternary iron selenides
• Block antiferromagnetism and possible ferroelectricity in KFe${}_2$Se${}_2$
• Intertwined charge, spin, and pairing orders in doped iron ladders
• Evidence the ferromagnetic order on CoSb layer of LaCoSb${}_2$
• Stealth Majorana Zero Mode in a Trilayer Heterostructure MnTe/Bi2Te3/Fe(Te,Se)
• Fermi surface evolution and checker-board block-spin antiferromagnetism in $A_x$Fe${}_{2-y}$Se${}_2$