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We report a x-ray resonant diffraction study of the perovskitePr0.6Ca0.4MnO3. At the Mn K-edge, this technique is sensitive to details of theelectronic structure of the Mn atoms. We discuss the resonant x-ray spectrameasured above and below the charge and orbital ordering phase transitiontemperature (TCOO = 232 K), and present a detailed analysis of the energy andpolarization dependence of the resonant scattering. The analysis confirms thatthe structural transition is a transition to an orbitally ordered phase inwhich inequivalent Mn atoms are ordered in a CE-type pattern. The Mn atomsdiffer mostly by their 3d orbital occupation. We find that the chargedisproportionation is incomplete, 3d^{3.5-\delta} and 3d^{3.5+\delta} with\delta\ll0.5 . A revised CE-type model is considered in which there are two Mnsublattices, each with partial e_{g} occupancy. One sublattice consists of Mnatoms with the 3x^{2}-r^{2} or 3y^{2}-r^{2} orbitals partially occupied, theother sublattice with the x^{2}-y^{2} orbital partially occupied.Comment: 15 pages, 15 figure

physical review. b, condensed matter and materials physics

Resonant x-ray diffraction of the magnetoresistant perovskite<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Pr</mml:mi></mml:mrow><mml:mrow><mml:mn>0.6</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ca</mml:mi></mml:mrow><mml:mrow><mml:mn>0.4</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">MnO</mml:mi></mml…

Resonant x-ray diffraction of the magnetoresistant perovskitePr0.6Ca0.4MnO