Multiple-magnon excitations shape the spin spectrum of cuprate parent compounds Thanks to high resolution and polarization analysis, resonant inelastic x-ray scattering (RIXS) magnetic spectra of La2CuO4, Sr2CuO2Cl2 and CaCuO2 reveal a rich set of properties of the spin-1/2 antiferromagnetic square lattice of cuprates. The leading single-magnon peak energy dispersion is in excellent agreement with the … Continue reading Multiple-magnon excitations shape the spin spectrum of cuprate parent compounds