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Double stripe ordering in Nd0.5Sr0.5MnO3 determined by resonant soft x-ray scattering

AutorHerrero-Martín, Javier; García, Joaquín; Subías, G.; Blasco, Javier; Sánchez, María Concepción; Stanescu, Stefan
Palabras claveNeodymium compounds
Strontium compounds
X-ray scattering
Colossal magnetoresistance
Fecha de publicaciónjun-2006
EditorAmerican Physical Society
CitaciónPhysical Review - Section B - Condensed Matter 73(22): 224407.1-224407.7 (2006)
ResumenWe have studied the low-temperature ordered phase of Nd0.5Sr0.5MnO3 by resonant soft x-ray scattering at the Mn L2,3 edges. Strong resonances were observed at (0 0) and ( 0 0) reflections, which are resolved in momentum space. Azimuthal scans reveal a periodicity for both resonances, the minimum intensity being almost zero. The two reflections show a very different energy dependence which extends in the whole energy region of the Mn L-edge. The (0 0) reflection originates from the anisotropy induced on the d-symmetry projected density of states owing to the local tetragonal distortion at one of the two crystallographic inequivalent Mn sites (the so-called Mn3+ ions in the conventional ionic description). This is similar to the resonance observed at the Mn K edge. We propose that the ( 0 0) reflection, which has not its counterpart either on the Mn K-edge resonant scattering or on the magnetic scattering, is originated by anisotropy of the d-symmetry projected density of the so-called Mn4+ sublattice. In this way, the latter reflection could denote a pure orbital ordering in this sublattice.
Descripción7 pages, 8 figures.-- PACS number(s): 75.47.Lx, 78.70.Ck, 71.30.+h
Versión del editorhttp://dx.doi.org/10.1103/PhysRevB.73.224407
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