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In this paper we present the results of a high temperature (300 K<T<800 K)neutron powder diffraction study of the La1.4Sr1.6Mn2O7 bilayered manganite. Anunusual trend of the <Mn-Oapical>/Mn-Oequatorial parameter was found: it firstdecreases up to 500 K and then increases up to the highest T measured. At thesame time, a significant shortening of the apical Mn-O(2) bond is observed inthe range where the J-T distortion is reduced. The overall data gained by thisstudy may suggest a shift of electronic density from axial to planar egorbitals with T. This trend is explained considering of the presence of shortrange magnetic interaction well above TC.Comment: 18 pages, 6 figure

physical review. b, condensed matter and materials physics

High-temperature neutron diffraction study of the bilayered manganite<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>La</mml:mi><mml:mn>1.4</mml:mn></mml:msub><mml:msub><mml:mi>Sr</mml:mi><mml:mn>1.6</mml:mn></mml:msub><mml:msub><mml:mi>Mn</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>7</mml:mn></mml:msub></mml:mrow></mml:math>

High-temperature neutron diffraction study of the bilayered manganiteLa1.4Sr1.6Mn2O7