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We assess the capabilities of magnetic Resonant Inelastic X-ray Scattering(RIXS) at the O $K$ edge in undoped cuprates by taking La_{2}CuO_{4} as abenchmark case, based on a series of RIXS measurements that we present here. Bycombining the experimental results with basic theory we point out thefingerprints of bimagnon in the O $K$ edge RIXS spectra. These are a dominantpeak around 450 meV, the almost complete absence of dispersion both with $\pi$and $\sigma$ polarization and the almost constant intensity vs. the transferredmomentum with $\sigma$ polarization. This behavior is quite different from Cu$L_3$ edge RIXS giving a strongly dispersing bimagnon tending to zero at thecenter of the Brillouin zone. This is clearly shown by RIXS measurements at theCu $L_3$ edge that we present. The Cu $L_3$ bimagnon spectra and those at Cu$K$ edge - both from the literature and from our data - however, have the sameshape. These similarities and differences are understood in terms of differentsampling of the bimagnon continuum. This panorama points out the uniquepossibilities offered by O $K$ RIXS in the study of magnetic excitations incuprates near the center of the BZ.

physical review. b, condensed matter and materials physics

Bimagnon studies in cuprates with Resonant Inelastic X-ray Scattering at  the O K edge. I - An assessment on La2CuO4 and a comparison with the  excitation at Cu L3 and Cu K edges