Spin correlations in Na(x)CoO(2) with x=0.8 and 0.5
文献类型：期刊论文
| 作者 | Guo, YQ ; Li, Z ; Wang, NL ; Jin, D ; Luo, JL |
| 刊名 | JOURNAL OF PHYSICS-CONDENSED MATTER
 |
| 出版日期 | 2008 |
| 卷号 | 20期号:44 |
| 关键词 | CO-59-NMR KNIGHT-SHIFT PHASE-TRANSITIONS CRYSTAL-STRUCTURE NA0.5COO2 SUPERCONDUCTIVITY DIFFRACTION NMR |
| ISSN号 | 0953-8984 |
| 通讯作者 | Guo, YQ (reprint author), Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Zhejiang, Peoples R China. |
| 中文摘要 | We present magnetization, specific heat, and Hall coefficient measurements on high quality Na(x)CoO(2) single crystals with x = 0.8 and 0.5. Similar to Na(0.85)CoO(2), a metamagnetic transition at about 20 K with H || c was observed in Na(0.8)CoO(2) under a magnetic field of 9 T. This suggests that the common metamagnetic transition around 20 K would occur under a moderate magnetic field of similar to 9 T in Na(x)CoO(2) with high x. For x = 0.5, we carried out elaborate specific heat investigations around 85 K under different magnetic fields. The results show an anisotropic nature of the transition at 85 K. This anisotropic property, revealed by both susceptibility and specific heat measurements, indicates that the spins are mainly pointing perpendicular to the c axis for x = 0.5 crystal. Moreover, by fitting the specific heat data below 46 K, a gap in low-lying excitation spectra is found and the gap value is estimated to be about 7.6 meV. This opening of the gap would account for the insulating ground state of Na(0.5)CoO(2). |
| 收录类别 | SCI |
| 资助信息 | National Natural Science Foundation of China; Knowledge Innovation Project of Chinese Academy of Sciences |
| 语种 | 英语 |
| 公开日期 | 2013-09-24 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/52870]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | Guo, YQ,Li, Z,Wang, NL,et al. Spin correlations in Na(x)CoO(2) with x=0.8 and 0.5[J]. JOURNAL OF PHYSICS-CONDENSED MATTER,2008,20(44). |
| APA | Guo, YQ,Li, Z,Wang, NL,Jin, D,&Luo, JL.(2008).Spin correlations in Na(x)CoO(2) with x=0.8 and 0.5.JOURNAL OF PHYSICS-CONDENSED MATTER,20(44). |
| MLA | Guo, YQ,et al."Spin correlations in Na(x)CoO(2) with x=0.8 and 0.5".JOURNAL OF PHYSICS-CONDENSED MATTER 20.44(2008). |
入库方式： OAI收割
来源：物理研究所
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