Infrared spectrum and its implications for the electronic structure of the semiconducting iron selenide K${}_{0.83}$Fe${}_{1.53}$Se${}_2$

Abstract

We report an infrared spectroscopy study on K${}_{0.83}$Fe${}_{1.53}$Se${}_2$, a semiconducting parent compound of the new iron-selenide system. The major spectral features are found to be distinctly different from all other Fe-based superconducting systems. Our measurement revealed two peculiar spectral structures: a double peak structure between 4000-6000 cm${}^{-1}$ and abundant phonon modes much more than those expected for a 122 structure. We elaborate that those features could be naturally explained from the blocked antiferromagnetism due to the presence of Fe vacancy ordering as determined by recent neutron diffraction experiments. The double peaks reflect the coexistence of ferromagnetic and antiferromagnetic couplings between the neighboring Fe sites.

revised version published in Physical Review B, Rapid Communications

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• Theory for superconductivity in (Tl,K)Fe${}_x$Se${}_2$ as a doped Mott insulator
• Optical conductivity of iron-based superconductors
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• Structural, Magnetic and Electronic Properties of the Iron-Chalcogenide A${}_x$Fe${}_{2-y}$Se${}_2$ (A=K, Cs, Rb, Tl and etc.) Superconductors
• Unconventional Mott Transition in KxFe2-ySe2
• Two-magnon Raman scattering in A${}_{0.8}$Fe${}_{1.6}$Se${}_2$ systems: competition between superconductivity and antiferromagnetic order
• Modulated superconductivity due to vacancy and magnetic order in $A_x$Fe${}_{2-x/2}$Se${}_2$ [$A=$Cs, K, (Tl,Rb), (Tl,K)] iron-selenide superconductors
• Optical conductivity of superconducting K{0.8}Fe{2-y}Se2 single crystals: Evidence for a Josephson-coupled phase
• Effect of iron content and potassium substitution in A${}_{0.8}$Fe${}_{1.6}$Se${}_2$ (A = K, Rb, Tl) superconductors: a Raman-scattering investigation
• Optical properties of iron-based superconductor LiFeAs single crystal
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• Electronic and Magnetic Structures of Chain Structured Iron Selenide Compounds
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• Tightly-bound and room-temperature-stable excitons in van der Waals degenerate-semiconductor Bi4O4SeCl2 with high charge-carrier density
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• Phase separation in iron chalcogenide superconductor Rb0.8+xFe1.6+ySe2 as seen by Raman light scattering and band structure calculations