Abstract
By means of synchrotron x-ray and electron diffraction, we studied the structural changes at the charge order transition K in the mixed-valence quadruple perovskite . Below we find satellite peaks indicating a commensurate structural modulation with the same propagation vector of the CE magnetic structure that orders at low temperatures, similarly to the case of simple perovskites such as . In the present case, the modulated structure, together with the observation of a large entropy change at , gives evidence of a rare case of full charge and orbital order, consistent with the Goodenough-Kanamori model.
- Received 26 August 2014
- Revised 2 October 2014
DOI:https://doi.org/10.1103/PhysRevB.90.180101
©2014 American Physical Society