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The local and intermediate structure of stoichiometric LaMnO$_3$ has beenstudied in the pseudocubic and rhombohedral phases at high temperatures (300 to1150 K). Neutron powder diffraction data were collected and a combined Rietveldand high real space resolution atomic pair distribution function analysiscarried out. The nature of the Jahn-Teller (JT) transition around 750 K isconfirmed to be orbital order to disorder. In the high temperature orthorhombic($O$) and rhombohedral ($R$) phases the MnO$_6$ octahedra are still fullydistorted locally. The data suggest the presence of local orbitally orderedclusters of diameter $\sim 16$ \AA ($\sim$four MnO$_6$ octahedra) implyingstrong nearest neighbor JT anti-ferrodistortive coupling.Comment: 4 pages, 4 figures, submitted to Phys. Rev. Le

physical review letters

Orbital Correlations in the Pseudocubic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>O</mml:mi></mml:math>and Rhombohedral<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>R</mml:mi></mml:math>Phases of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>LaMnO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>

Orbital Correlations in the PseudocubicOand RhombohedralRPhases ofLaMnO3