Orbital-dependent phase control in Ca2-xSrxRuO4 (0 <= x <= 0.5)
文献类型：期刊论文
| 作者 | Fang, Z ; Nagaosa, N ; Terakura, K |
| 刊名 | PHYSICAL REVIEW B
 |
| 出版日期 | 2004 |
| 卷号 | 69期号:4 |
| 关键词 | ELECTRONIC-STRUCTURE INSULATOR-TRANSITION MOTT TRANSITION METAL CA2RUO4 CA2-XSR(X)RUO4 MAGNETISM OXIDES |
| ISSN号 | 1098-0121 |
| 通讯作者 | Fang, Z (reprint author), Chinese Acad Sci, Inst Phys, POB 603, Beijing 100080, Peoples R China. |
| 中文摘要 | We present first-principles studies on the orbital states of the layered perovskites Ca2-xSrxRuO4. The crossover from antiferromagnetic (AF) Mott insulator for x<0.2 to nearly ferromagnetic (FM) metal at x=0.5 is characterized by the systematic change of the xy orbital occupation. For the AF side (x<0.2), we present firm evidence for the xy ferro-orbital ordering. It is found that the degeneracy of t(2g) (or e(g)) states is lifted robustly due to the two-dimensional crystal structure, even without the Jahn-Teller distortion of RuO6. This effect dominates, and the cooperative occupation of xy orbital is concluded. In contrast to recent proposals, the resulting electronic structure explains well both the observed x-ray-absorption spectra and the double-peak structure of optical conductivity. For the FM side (x=0.5), however, the xy orbital with half filling opens a pseudo-gap in the FM state and contributes to the spin S=1/2 moment (rather than S=1 for x=0.0 case) dominantly, while yz,zx states are itinerant with very small spin polarization, explaining the recent neutron data consistently. |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2013-09-24 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/50425]  |
| 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 | Fang, Z,Nagaosa, N,Terakura, K. Orbital-dependent phase control in Ca2-xSrxRuO4 (0 <= x <= 0.5)[J]. PHYSICAL REVIEW B,2004,69(4). |
| APA | Fang, Z,Nagaosa, N,&Terakura, K.(2004).Orbital-dependent phase control in Ca2-xSrxRuO4 (0 <= x <= 0.5).PHYSICAL REVIEW B,69(4). |
| MLA | Fang, Z,et al."Orbital-dependent phase control in Ca2-xSrxRuO4 (0 <= x <= 0.5)".PHYSICAL REVIEW B 69.4(2004). |
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。