Abstract
Resonant magnetic x-ray scattering measurements have been performed on a single crystal of to uniquely determine the modulation wave vector in the low-temperature orthorhombic phase. Below the transition temperature of two magnetic satellite peaks develop, centered on charge reflections. Our study shows that the longitudinal modulation of the magnetic moment is along the longer basal plane axes of the orthorhombic phase. Power law fits to the temperature dependence of the structural distortion, and the magnetic scattering intensity result in the same exponent, and transition temperature evidencing explicitly that the structural phase transition is magneto-elastic in origin.
- Received 25 August 2000
DOI:https://doi.org/10.1103/PhysRevB.63.104507
©2001 American Physical Society