Raman spectroscopy study ofα-,β-,γ−NaxCoO2andγ−(Ca,Sr)xCoO2
| العنوان: | Raman spectroscopy study ofα-,β-,γ−NaxCoO2andγ−(Ca,Sr)xCoO2 |
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| المؤلفون: | X. Liu, Youyan Liu, Ruijuan Xiao, Y. G. Shi, H. X. Yang, Yunyouyou Xia, J. Q. Li, H. F. Tian |
| المصدر: | Physical Review B. 74 |
| بيانات النشر: | American Physical Society (APS), 2006. |
| سنة النشر: | 2006 |
| مصطلحات موضوعية: | Superconductivity, Crystal, Physics, Crystallography, symbols.namesake, Nuclear magnetic resonance, Octahedron, symbols, Condensed Matter Physics, Raman spectroscopy, Electronic, Optical and Magnetic Materials |
| الوصف: | Raman spectroscopy measurements have been performed on $\ensuremath{\alpha}$-, $\ensuremath{\beta}$-, and $\ensuremath{\gamma}\text{\ensuremath{-}}{\mathrm{Na}}_{x}\mathrm{Co}{\mathrm{O}}_{2}$ phases differing in their stacking of $\mathrm{Co}{\mathrm{O}}_{6}$ octahedra along the $c$-axis direction. The results demonstrate that, in general, there are five Raman active phonons for $\ensuremath{\gamma}\text{\ensuremath{-}}{\mathrm{Na}}_{0.75}\mathrm{Co}{\mathrm{O}}_{2}$, two Raman active phonons for $\ensuremath{\alpha}\text{\ensuremath{-}}\mathrm{Na}\mathrm{Co}{\mathrm{O}}_{2}$, and three Raman peaks for $\ensuremath{\beta}\text{\ensuremath{-}}{\mathrm{Na}}_{0.6}\mathrm{Co}{\mathrm{O}}_{2}$. We have also performed Raman-scattering measurements on several $\ensuremath{\gamma}\text{\ensuremath{-}}{(\mathrm{Ca},\mathrm{Sr})}_{x}\mathrm{Co}{\mathrm{O}}_{2}$ $(0.15\ensuremath{\leqslant}x\ensuremath{\leqslant}0.40)$ samples which show well-defined intercalated $\mathrm{Ca}∕\mathrm{Sr}$ ordering. The experimental data show that the intercalated cation ordering could result in visible alterations on Raman spectral structures. The observations of the spectral changes along with the variation of the $\mathrm{Co}{\mathrm{O}}_{6}$ stacking, as well as the intercalated $\mathrm{Sr}∕\mathrm{Ca}$ ordering suggest that the interlayer interaction plays an important role for understanding the phonon properties in this layered system. |
| تدمد: | 1550-235X 1098-0121 |
| DOI: | 10.1103/physrevb.74.094301 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::c10764f8d528ac3eca033746f8a4c53e https://doi.org/10.1103/physrevb.74.094301 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi...........c10764f8d528ac3eca033746f8a4c53e |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 1550235X 10980121 |
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| DOI: | 10.1103/physrevb.74.094301 |