Direct observation of oxygen superstructures in manganites

Autor:	Grenier, S., Thomas, K. J., Hill, J. P., Staub, U., Bodenthin, Y., García-Fernández, M., Scagnoli, V., Kiryukhin, V., Cheong, S-W., Kim, B. G., Tonnerre, J. M.
Rok vydání:	2007
Předmět:	Condensed Matter - Strongly Correlated Electrons
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevLett.99.206403
Popis:	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. Comment: 5 pages
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0707.4388 Zobrazit plný text záznamu View this record from Arxiv