Mean-field dynamics of a Bose Josephson junction in an optical cavity
文献类型：期刊论文
| 作者 | Zhang, JM ; liu, WM ; Zhou, DL |
| 刊名 | PHYSICAL REVIEW A
 |
| 出版日期 | 2008 |
| 卷号 | 78期号:4 |
| 关键词 | EINSTEIN CONDENSATE COHERENT OSCILLATIONS SINGLE PHOTONS DOUBLE-WELL ATOMS CHIP |
| ISSN号 | 1050-2947 |
| 通讯作者 | Zhang, JM: Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing, Peoples R China. |
| 中文摘要 | Hall effect and magnetoresistance have been measured on single crystals of NdFeAsO(1-x)F(x) with x=0 (T(c)=0 K) and x=0.18 (T(c)=50 K). For the undoped samples, strong Hall effect and magnetoresistance with strong temperature dependence were found below about 150 K. The magnetoresistance was found to be as large as 30% at 15 K at a magnetic field of 9 T. From the transport data we found that the transition near 155 K was accomplished in two steps: first one occurs at 155 K which may be associated with the structural transition, the second one takes place at about 140 K which may correspond to the spin-density-wave-like transition. In the superconducting sample with T(c)=50 K, it is found that the Hall coefficient also reveals a strong temperature dependence with a negative sign. But the magnetoresistance becomes very weak and does not satisfy Kohler's scaling law. These dilemmatic results (strong Hall effect and very weak magnetoresistance) prevent understanding of the normal-state electric conduction by a simple multi-band model by taking into account the electron and hole pockets. Detailed analysis further indicates that the strong temperature dependence of R(H) cannot be easily understood with the simple multi-band model either. A picture concerning a suppression to the density of states at the Fermi energy in lowering temperature is more reasonable. A comparison between the Hall coefficient of the undoped sample and the superconducting sample suggests that the doping may remove the nesting condition for the formation of the spin-density wave order, since both samples have very similar temperature dependence above 175 K. |
| 收录类别 | SCI |
| 资助信息 | NSF of China [90406017, 60525417, 10775176]; NKBRSF of China [2005CB724508, 2006CB921400, 2006CB921206, 2006AA06Z104] |
| 语种 | 英语 |
| 公开日期 | 2013-09-18 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/41799]  |
| 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 | Zhang, JM,liu, WM,Zhou, DL. Mean-field dynamics of a Bose Josephson junction in an optical cavity[J]. PHYSICAL REVIEW A,2008,78(4). |
| APA | Zhang, JM,liu, WM,&Zhou, DL.(2008).Mean-field dynamics of a Bose Josephson junction in an optical cavity.PHYSICAL REVIEW A,78(4). |
| MLA | Zhang, JM,et al."Mean-field dynamics of a Bose Josephson junction in an optical cavity".PHYSICAL REVIEW A 78.4(2008). |
入库方式： OAI收割
来源：物理研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。