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


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2018-03

AUTHORS

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

ABSTRACT

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 L2,3-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. More... »

PAGES

158-165

Identifiers

URI

http://scigraph.springernature.com/pub.10.1134/s1063774518020189

DOI

http://dx.doi.org/10.1134/s1063774518020189

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1103195652


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