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<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>KFe</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Se</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>is the Parent Compound of K-Doped Iron Selenide Superconductors
We elucidate the existing controversies in the newly discovered K-doped iron selenide (${\mathrm{K}}_{x}{\mathrm{Fe}}_{2\ensuremath{-}y}{\mathrm{Se}}_{2\ensuremath{-}z}$) superconductors. The stoichiometric ${\mathrm{KFe}}_{2}{\mathrm{Se}}_{2}$ with $\sqrt{2}\ifmmode\times\else\texttimes\fi{}\sqrt{2}$ charge ordering was identified as the parent compound of ${\mathrm{K}}_{x}{\mathrm{Fe}}_{2\ensuremath{-}y}{\mathrm{Se}}_{2\ensuremath{-}z}$ superconductor using scanning tunneling microscopy and spectroscopy. The superconductivity is induced in ${\mathrm{KFe}}_{2}{\mathrm{Se}}_{2}$ by either Se vacancies or interacting with the …