Orbital correlations in the pseudo-cubic \emph{O} and rhombohedral ${R}$-phases of LaMnO$_3$

Details Orbital correlations in the pseudo-cubic \emph{O} and rhombohedral ${R}$-phases of LaMnO$_3$ Orbital correlations in the pseudo-cubic \emph{O} and rhombohedral ${R}$-phases of LaMnO$_3$

2004-08-13

arxiv.org/abs/cond-mat/0408304v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures, submitted to Phys. Rev. Let

Scientific paper

10.1103/PhysRevLett.94.177203

The local and intermediate structure of stoichiometric LaMnO$_3$ has been studied in the pseudocubic and rhombohedral phases at high temperatures (300 to 1150 K). Neutron powder diffraction data were collected and a combined Rietveld and high real space resolution atomic pair distribution function analysis carried out. The nature of the Jahn-Teller (JT) transition around 750 K is confirmed to be orbital order to disorder. In the high temperature orthorhombic ($O$) and rhombohedral ($R$) phases the MnO$_6$ octahedra are still fully distorted locally. The data suggest the presence of local orbitally ordered clusters of diameter $\sim 16$ \AA ($\sim$four MnO$_6$ octahedra) implying strong nearest neighbor JT anti-ferrodistortive coupling.

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