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We analyze theoretically the resonant inelastic x-ray scattering (RIXS) atthe Ni K edge in the stripe-ordered state of La_{2-x}Sr_xNiO_4 at x=1/3. In thecalculation of RIXS spectra, the stripe-ordered ground state is describedwithin the Hartree-Fock approximation by using a realistic tight-binding modelfor Ni3d\gamma and O2p_{x, y} orbitals, and the electron correlations in theelectronic excitation processes are taken into account within the random-phaseapproximation. The calculated RIXS spectrum shows a tail toward the low-energyregion when the momentum transfer of photons equals the stripe vector Q, beingconsistent with a recent experimental result. The origin of this anomalousmomentum dependence of RIXS spectra is discussed microscopically.

Analysis of Resonant Inelastic X-Ray Scattering in Stripe-Ordered Nickelate