Abstract
We report a high-resolution resonant inelastic x-ray scattering investigation of the bilayer manganites with and 0.5. The momentum dependence along the crystallographic (110) direction for energy losses has been measured in detail with the data analysis focusing on the energy-loss region , which includes a strong peak located at . We observe a clear dispersion of up to 0.5 eV in the measured range, which is direct evidence of the nonlocal character of this excitation. Further, we found that the intensity in this low-energy region strongly depends on both the reduced wave vector , , and temperature, i.e., different ordered phases. Results can be explained via an intersite charge-transfer excitation, proposed for pseudocubic manganites, where the hopping rate is strongly increased (decreased) by ferromagnetic (antiferromagnetic) alignment of neighboring in-plane Mn ion core spins.
- Received 5 May 2010
DOI:https://doi.org/10.1103/PhysRevB.82.085105
©2010 American Physical Society