Observation of x-ray magnetic scattering inNd2CuO4

We report the observation of resonant x-ray magnetic scattering in ${\mathrm{Nd}}_2$ ${\mathrm{CuO}}_4$. The experiments were performed by tuning the incident energy to the Nd ${\mathit{L}}_{\mathrm{I}}$, ${\mathit{L}}_{\mathrm{II}}$, and ${\mathit{L}}_{\mathrm{III}}$ absorption edges. The largest count rates, up to 300 counts per second, were obtained at the ${\mathit{L}}_{\mathrm{II}}$ edge. Antiferromagnetic long-range order is seen below ${\mathit{T}}_{\mathrm{Nd}}$=37 K. Polarization analysis confirms that the scattering is magnetic in origin and consistent with a dipole excitation, suggesting that the Nd 5d bands are polarized.