Journal of the Physical Society of Japan · 1999 · 87 citations · 14 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsMagnetic MaterialsMaterials PhysicsAntiferromagnetic MaterialsAntiferromagnetismMagnetic OxidesMagnetic Properties Of SolidsMagnetism In SolidsX-ray CrystallographyCharge Density AnalysisCharge DistributionMagnetic Structure DeterminationMagnetic Sublattice StructureManganitesOrbital OrderPolarizationSynchrotron X-ray Diffraction
We have investigated the charge-density distribution of an antiferromagnetic bi-layered manganite, NdSr 2 Mn 2 O 7 , by the maximum entropy method (MEM) using the synchrotron X-ray powder data. The magnetic structure below T N =150 K is known to be a layered-type (A-type). We have found a significant change of the electron distribution around the Mn site below T N . Our observation indicates d x 2 - y 2 -orbital polarization in the A-type antiferromagnetic state.
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