تقرير
Intermediate-valence behavior of the transition-metal oxide CaCu$_3$Ru$_4$O$_{12}$
| العنوان: | Intermediate-valence behavior of the transition-metal oxide CaCu$_3$Ru$_4$O$_{12}$ |
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| المؤلفون: | Krimmel, A., Günther, A., Kraetschmer, W., Dekinger, H., Büttgen, N., Eyert, V., Loidl, A., Sheptyakov, D. V., Scheidt, E. -W., Scherer, W. |
| المصدر: | Phys. Rev. B Vol. 80, 121101(R) (2009) |
| سنة النشر: | 2009 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Materials Science |
| الوصف: | The transition--metal oxide CaCu$_3$Ru$_4$O$_{12}$ with perovskite--type structure shows characteristic properties of an intermediate--valence system. The temperature--dependent susceptibility exhibits a broad maximum around $150 - 160$ K. At this temperature, neutron powder diffraction reveals a small but significant volume change whereby the crystal structure is preserved. Moreover, the temperature--dependent resistivity changes its slope. NMR Knight shift measurements of Ru reveal a cross--over from high temperature paramagnetic behavior of localized moments to itinerant band states at low temperatures. Additional density--functional theory calculations can relate the structural anomaly with the $d$--electron number. The different experimental and calculational methods result in a mutually consistent description of CaCu$_3$Ru$_4$O$_{12}$ as an intermediate--valent system in the classical sense of having low--energy charge fluctuations. Comment: 4 pages, 3 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevB.80.121101 |
| URL الوصول: | http://arxiv.org/abs/0909.4208 |
| رقم الأكسشن: | edsarx.0909.4208 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevB.80.121101 |
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