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Magnetic excitation spectrum of Na<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>IrO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub></mml:math>probed with resonant inelastic x-ray scattering
The low energy excitations in ${\mathrm{Na}}_{2}{\mathrm{IrO}}_{3}$ have been investigated using resonant inelastic x-ray scattering (RIXS). A magnetic excitation branch can be resolved, whose dispersion reaches a maximum energy of about 35 meV at the $\ensuremath{\Gamma}$ point. The momentum dependence of the excitation energy is much larger along the $\ensuremath{\Gamma}\ensuremath{-}X$ direction …