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The Structure of Nanoscale Polaron Correlations in La1.2Sr1.8Mn2O7

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arxiv cond-mat/0106477 v2 pith:COVLJ6CK submitted 2001-06-22 cond-mat.mtrl-sci

B. J. Campbell , R. Osborn , D. N. Argyriou , L. Vasiliu-Doloc , J. F. Mitchell , S. K. Sinha , U. Ruett , C. D. Ling
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Z. Islam J. W. Lynn
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classification cond-mat.mtrl-sci
keywords polaroncorrelationsmn2o7structureanalysisbeenbroadcharge
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A system of strongly-interacting electron-lattice polarons can exhibit charge and orbital order at sufficiently high polaron concentrations. In this study, the structure of short-range polaron correlations in the layered colossal magnetoresistive perovskite manganite, La1.2Sr1.8Mn2O7, has been determined by a crystallographic analysis of broad satellite maxima observed in diffuse X-ray and neutron scattering data. The resulting q=(0.3,0,1) modulation is a longitudinal octahedral-stretch mode, consistent with an incommensurate Jahn-Teller-coupled charge-density-wave fluctuations, that implies an unusual orbital-stripe pattern parallel to the <100> directions.

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