Direct observation of oxygen superstructures in manganites
Strongly Correlated Electrons
2009-11-13 v1
Abstract
We report the observation of superstructures associated with the oxygen 2p-states in two prototypical manganites using x-ray diffraction at the oxygen K-edge. We determine the nature of the orderings and discuss our picture with respect to novel theoretical models. In the stripe order system Bi0.31 Ca0.69 MnO3, hole-doped O states are found to be orbitally ordered, at the same propagation vector as the Mn orbital ordering, but no evidence is found to support a picture of oxygen charge stripes at this periodicity. In La 7/8 Sr 1/8 MnO3, we observe a 2p charge ordering described by alternating hole-poor and hole-rich MnO planes that is consistent with recent predictions.
Keywords
Cite
@article{arxiv.0707.4388,
title = {Direct observation of oxygen superstructures in manganites},
author = {S. Grenier and K. J. Thomas and J. P. Hill and U. Staub and Y. Bodenthin and M. García-Fernández and V. Scagnoli and V. Kiryukhin and S-W. Cheong and B. G. Kim and J. M. Tonnerre},
journal= {arXiv preprint arXiv:0707.4388},
year = {2009}
}
Comments
5 pages