تقرير
Direct observation of charge order in triangular metallic AgNiO2 by single-crystal resonant X-ray scattering
| العنوان: | Direct observation of charge order in triangular metallic AgNiO2 by single-crystal resonant X-ray scattering |
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| المؤلفون: | Pascut, G. L., Coldea, R., Radaelli, P. G., Bombardi, A., Beutier, G., Mazin, I. I., Johannes, M. D., Jansen, M. |
| سنة النشر: | 2010 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Strongly Correlated Electrons |
| الوصف: | We report resonant X-ray scattering measurements on the orbitally-degenerate triangular metallic antiferromagnet 2H-AgNiO2 to probe the spontaneous transition to a triple-cell superstructure at temperatures below 365 K. We observe a strong resonant enhancement of the supercell reflections through the Ni K-edge. The empirically extracted K-edge shift between the crystallographically-distinct Ni sites of 2.5(3) eV is much larger than the value expected from the shift in final states, and implies a core-level shift of ~1 eV, thus providing direct evidence for the onset of spontaneous honeycomb charge order in the triangular Ni layers. We also provide band-structure calculations that explain quantitatively the observed edge shifts in terms of changes in the Ni electronic energy levels due to charge order and hybridization with the surrounding oxygens. Comment: 5 pages, 4 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevLett.106.157206 |
| URL الوصول: | http://arxiv.org/abs/1009.2053 |
| رقم الأكسشن: | edsarx.1009.2053 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevLett.106.157206 |
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