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We have investigated the low temperature phase of a Nd0.5Sr0.5MnO3 singlecrystal by x-ray resonant scattering at the Mn K-edge of the (3 0 0), (0 3 0)and (0 5/2 0) reflections. Strong resonances were observed for the s-s' channelin the (3 0 0) and (0 3 0) reflections and for the s-p' channel in the (0 5/20) reflection. These resonances show a p-periodicity on the azimuthal angle,having the intensity at the minimum position almost zero. The intensitydependence on the photon energy, azimuthal angle and polarisation dependencieshas been analysed using a semi-empirical structural model. Contrary to previousclaims of charge (Mn3+-Mn4+) and orbital ordering in this compound, our resultsshow that the dipole resonant superlattice reflections can be explained by thepresence of two types of Mn sites with different local geometric structure. Oneof the Mn sites is surrounded by a tetragonal-distorted oxygen octahedronwhereas the other site has a symmetric octahedral environment. This model alsoestablishes that no real space charge ordering is needed to explain theexperimental data. Intermediate valence states according to a fractionalcharge-segregation Mn+3.42-Mn+3.58 were deduced.Comment: 40 pages, 12 figures Presented at the ESRF 14th users meeting,  February, 2004. Physical Review B (to be published

physical review. b, condensed matter and materials physics

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Structural origin of dipole x-ray resonant scattering in the low-temperature phase ofNd0.5Sr0.5MnO3