High Temperature Neutron Diffraction Study of the La1.4Sr1.6mn2o7 Bilayered Manganite

Physics – Condensed Matter – Materials Science

Scientific paper

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18 pages, 6 figures

Scientific paper

10.1103/PhysRevB.72.054115

In this paper we present the results of a high temperature (300 K/Mn-Oequatorial parameter was found: it first decreases up to 500 K and then increases up to the highest T measured. At the same time, a significant shortening of the apical Mn-O(2) bond is observed in the range where the J-T distortion is reduced. The overall data gained by this study may suggest a shift of electronic density from axial to planar eg orbitals with T. This trend is explained considering of the presence of short range magnetic interaction well above TC.

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