X-Ray Natural Circular Dichroism in Langasite Crystal at the Ga and La Edges

Oreshko A. P.; Mill B. V.; Ovchinnikova E. N.; Rogalev A.; Wilhelm F.; Dmitrienko V. E.

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X-Ray Natural Circular Dichroism in Langasite Crystal at the Ga and La Edges

机译：GA和La边缘兰纳斯岩晶体中的X射线自然圆形二色性

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X-ray natural circular dichroism (XNCD) and its structural nature have been investigated in a langasite (La3Ga5SiO14) crystal at an incident radiation energy close to the Ga K-absorption edge and the La L-2,L-3-absorption edges. An XNCD signal was observed mainly beyond the absorption edge, which confirmed the existence of delocalized mixed p-d electronic states in Ga and d-f and d-p electronic states in La. Calculations with application of the multiple scattering method have made it possible to separate the contributions from three crystallographically nonequivalent Ga sites to the absorption spectrum and the XNCD signal and explain adequately the largest contribution of the Ga atom occupying the 1a site to the XNCD signal.

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《Crystallography reports》 |2018年第2期|共8页
作者
Oreshko A. P.; Mill B. V.; Ovchinnikova E. N.; Rogalev A.; Wilhelm F.; Dmitrienko V. E.;
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作者单位

Moscow MV Lomonosov State Univ Moscow Russia;

Moscow MV Lomonosov State Univ Moscow Russia;

Moscow MV Lomonosov State Univ Moscow Russia;

European Synchrotron Radiat Facil Grenoble France;

European Synchrotron Radiat Facil Grenoble France;

Russian Acad Sci Shubnikov Inst Crystallog Fed Sci Res Ctr Crystallog &

Photon Moscow 119333 Russia;

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正文语种 eng
中图分类晶体学;
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机译：GA和La边缘兰纳斯岩晶体中的X射线自然圆形二色性
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X-Ray Natural Circular Dichroism in Langasite Crystal at the Ga and La Edges

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