Thermal and Electrical Properties of γ-NaxCoO2(0.70 ≤x≤0.78)
| العنوان: | Thermal and Electrical Properties of γ-NaxCoO2(0.70 ≤x≤0.78) |
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| المؤلفون: | E. Takayama-Muromachi, N. Tsujii, Hiroya Sakurai |
| المصدر: | Journal of the Physical Society of Japan. 73:2393-2396 |
| بيانات النشر: | Physical Society of Japan, 2004. |
| سنة النشر: | 2004 |
| مصطلحات موضوعية: | Condensed Matter - Materials Science, Condensed Matter - Strongly Correlated Electrons, Materials science, Condensed matter physics, Specific heat, Electrical resistivity and conductivity, Thermal, General Physics and Astronomy, Instability, Magnetic transitions, Electric resistivity |
| الوصف: | We have performed specific heat and electric resistivity measurements of Na$_{x}$CoO$_{2}$ ($x=0.70$-0.78). Two anomalies have been observed in the specific heat data for $x=0.78$, corresponding to magnetic transitions at $T_{c}=22$ K and $T_{k}\simeq 9$ K reported previously. In the electrical resistivity, a steep decrease at $T_{c}$ and a bending-like variation at $T_{b}$(=120K for $x=0.78$) have been observed. Moreover, we have investigated the $x$-dependence of these parameters in detail. The physical properties of this system are very sensitive to $x$, and the inconsistent results of previous reports can be explained by a small difference in $x$. Furthermore, for a higher $x$ value, a phase separation into Na-rich and Na-poor domains occurs as we previously proposed, while for a lower $x$ value, from characteristic behaviors of the specific heat and the electrical resistivity at the low-temperature region, the system is expected to be in the vicinity of the magnetic instability which virtually exists below $x=0.70$. Comment: 4 pages (3 figures included) and an extra figure (gif), to be published in J. Phys. Soc. Jpn. 73 (9) with possible minor revisions |
| تدمد: | 1347-4073 0031-9015 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9fc5653cd7a49b6a8d9db43ae9a85900 https://doi.org/10.1143/jpsj.73.2393 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....9fc5653cd7a49b6a8d9db43ae9a85900 |
| قاعدة البيانات: | OpenAIRE |
Find this article in full text from Scitation. | تدمد: | 13474073 00319015 |
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