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The magnetic nature of Cs$_{2}$AgF$_{4}$, an isoelectronic and isostructuralanalogue of La$_2$CuO$_4$, is analyzed using density functional calculations.The ground state is found to be ferromagnetic and nearly half metallic. We findstrong hybridization of Ag-$d$ and F-$p$ states. Substantial moments reside onthe F atoms, which is unusual for the halides and reflects the chemistry of theAg(II) ions in this compound. This provides the mechanism for ferromagnetism,which we find to be itinerant in character, a result of a Stoner instabilityenhanced by Hund's coupling on the F

physical review. b, condensed matter and materials physics

Origin of ferromagnetism in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>Cs</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>AgF</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>: The importance of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>Ag</mml:mi><mml:mtext>−</mml:mtext><mml:mi mathvariant="normal">F</mml:mi></mml:mrow></mml:math>covalency

Origin of ferromagnetism inCs2AgF4: The importance ofAg−Fcovalency