Abstract
The magnetic phases of erbium have been studied by resonance x-ray-scattering techniques. When the incident x-ray energy is tuned near the [ital L][sub III] absorption edge, large resonant enhancements of the magnetic scattering are observed above 18 K. We have measured the energy and polarization dependence of this magnetic scattering and analyzed it using a simple model based on electric dipole and quadrupole transitions among atomic orbitals. The line shapes can be fitted to a magnetic structure combining both [ital c]-axis-modulated and basal-plane components. Below 18 K, we have observed unusual behavior of the magnetic scattering as a function of energy, whose origin is not understood.
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