Strongly momentum-dependent screening dynamics in La$_{0.5}$Sr$_{1.5}$MnO$_4$ observed with resonant inelastic x-ray scattering

A. T. Boothroyd; D. Casa; D. Prabhakaran; H. Ding; J. P. Hill; K. H. Ahn; Michel van Veenendaal; T. F. Seman; X. Liu

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Strongly momentum-dependent screening dynamics in La$_{0.5}$Sr$_{1.5}$MnO$_4$ observed with resonant inelastic x-ray scattering

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arxiv 1210.6634 v1 pith:JCL2H6PJ submitted 2012-10-24 cond-mat.str-el

X. Liu , T. F. Seman , K. H. Ahn , Michel van Veenendaal , D. Casa , D. Prabhakaran , A. T. Boothroyd , H. Ding

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J. P. Hill

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abstract

We report strongly momentum-dependent local charge screening dynamics in CE-type charge, orbital, and spin ordered La$_{0.5}$Sr$_{1.5}$MnO$_4$, based on Mn K-edge resonant inelastic x-ray scattering data. Through a comparison with theoretical calculations, we show that the observed momentum dependence reflects highly localized, nearest neighbor screening of the transient local charge perturbation in this compound with an exciton-like screening cloud, rather than delocalized screening. The size of the screening cloud is estmated to be about 0.4-0.5 interatomic distances.

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