Hard x-ray probe to study doping-dependent electron redistribution and strong covalency in La_(1-x)Sr_(1-x)MnO_4

J. Herrero-Martin; A. Mirone; J. Fernandez-Rodriguez; P. Glatzel; J. Garcia; J. Blasco; J. Geek

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Hard x-ray probe to study doping-dependent electron redistribution and strong covalency in La_(1-x)Sr_(1-x)MnO_4

机译：硬X射线探针研究La_（1-x）Sr_（1-x）MnO_4中依赖掺杂的电子重新分布和强共价

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The doping dependence of the occupied 3d states at the Mn sites of La_(1-x)Sr_(1-x)MnO_4 (x=0, 0.3, and 0.5) was studied by means of nonresonant hard x-ray emission spectroscopy. For trie single-crystalline samples, we observe a linear dichroism of the Mn Kβ main lines (3p to Ls- transitions) that is strongest for x=0 and decreases with increasing hole doping x. At the same time, the Mn Kβ main lines of polycrystalline samples, i.e., the angular-integrated spectra, remain almost unchanged upon hole doping. The linear dichroism in the single crystals and the invariance of the Kβ lines in polycrystals lead to the conclusion that hole doping causes a spatial redistribution of the 3d electrons without reducing the total charge and spin density at the manganese sites. This implies that the doped holes in La_(1-x)Sr_(1+x)MnO_4 must have a strong oxygen 2p character. Many-body cluster calculations are presented that support these findings.

机译：通过非共振硬X射线发射光谱研究了La_（1-x）Sr_（1-x）MnO_4（x = 0、0.3和0.5）的Mn位点上所占据的3d态的掺杂依赖性。对于单晶样品，我们观察到MnKβ主线（从3p到Ls-跃迁）的线性二向色性，对于x = 0最强，并且随着空穴掺杂x的增加而降低。同时，多晶样品的MnKβ主线，即角积分光谱，在掺杂空穴后几乎保持不变。单晶中的线性二向色性和多晶中Kβ线的不变性得出以下结论：空穴掺杂会导致3d电子的空间重新分布，而不会降低锰位点的总电荷和自旋密度。这意味着La_（1-x）Sr_（1 + x）MnO_4中的掺杂空穴必须具有强氧2p特性。提出了多体群集计算来支持这些发现。

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来源
《Physical review》 |2010年第7期|p.075112.1-075112.8|共8页
作者
J. Herrero-Martin; A. Mirone; J. Fernandez-Rodriguez; P. Glatzel; J. Garcia; J. Blasco; J. Geek;
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European Synchrotron Radiation Facility, F-38043 Grenoble Cedex 9, France;

rnEuropean Synchrotron Radiation Facility, F-38043 Grenoble Cedex 9, France;

rnEuropean Synchrotron Radiation Facility, F-38043 Grenoble Cedex 9, France;

rnEuropean Synchrotron Radiation Facility, F-38043 Grenoble Cedex 9, France;

rnInstitute de Ciencia de Materiales de Aragon, CSIC-Universidad de Zaragoza, E-50009 Zaragoza, Spain;

rnInstitute de Ciencia de Materiales de Aragon, CSIC-Universidad de Zaragoza, E-50009 Zaragoza, Spain;

rnIFW Dresden, P.O. Box 270116, D-0II71 Dresden, Germany;

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narrow-band systems; intermediate-valence solids; X-ray emission spectra and fluorescence; theories and models of many-electron systems; manganites;

机译：窄带系统;中价固体;X射线发射光谱和荧光;多电子系统的理论和模型;锰矿;

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Hard x-ray probe to study doping-dependent electron redistribution and strong covalency in La_(1-x)Sr_(1-x)MnO_4

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