Doping effects on the phase separation in perovskite La0.67-xBixCa0.33MnO3
文献类型：期刊论文
| 作者 | Sun, JR ; Gao, J ; Fei, Y ; Li, RW ; Shen, BG |
| 刊名 | PHYSICAL REVIEW B
 |
| 出版日期 | 2003 |
| 卷号 | 67期号:14 |
| 关键词 | METAL-INSULATOR-TRANSITION CHARGE-ORDERED STATE THIN-FILMS MAGNETIC-FIELD COLOSSAL MAGNETORESISTANCE BULK LA1/3ND1/3CA1/3MNO3 MANGANESE PEROVSKITES ELECTRONIC TRANSPORT MANGANITES PR0.5CA0.5MNO3 |
| ISSN号 | 1098-0121 |
| 通讯作者 | Sun, JR: Chinese Acad Sci, State Key Lab Magnetism, Inst Phys, Beijing 100080, Peoples R China. |
| 中文摘要 | Effects of Bi, Cr, and Fe doping on phase separation of La0.67Ca0.33MnO3 have been experimentally studied. As proved by the electron-spin resonance and neutron-diffraction studies, partial replacement of La by Bi causes the simultaneous occurrence of ferromagnetic (FM) phase and charge-ordered antiferromagnetic phase. As a consequence, two subsequent magnetic transitions at similar to120 K and similar to230 K are resulted. A strong coupling between the coexisted phases is assumed, which is responsible for the insensitivity of T-c(L), the higher Curie temperature, to Bi doping after the appearance of phase separation, and consistent with the discontinuous variation of T-c(L) with Cr doping. As expected, the substitution of Cr for Mn in this case promotes the FM order, but its effects are significantly different for the two magnetic states. Each Cr drives similar to100 neighboring unit cells, for the high-moment state, and similar to60 unit cells, for the low-moment state, into the FM state. Two definite processes can be identified for the melting of the charge-ordered phase. The FM fraction increases rapidly in the initial stage of Cr doping, and then slowly when the FM population exceeds similar to90%. This could be a common feature of the phase-separated system suffering from random-phase fluctuation according to a theoretical analysis. Exactly opposite effects on phase constituent are produced by Cr doping and Bi doping, and 1% Cr are equivalent to similar to4.6% Bi. In contrast, both Cr doping and magnetic field promote the FM order. 1% Cr correspond to a field of similar to4.5 T for the low-moment state and 6 T for the high-moment state, reducing the energy difference between the charge ordering and the FM states by similar to0.96 meV/Mn and similar to1.3 meV/Mn, respectively. |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2013-09-17 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/36196]  |
| 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 | Sun, JR,Gao, J,Fei, Y,et al. Doping effects on the phase separation in perovskite La0.67-xBixCa0.33MnO3[J]. PHYSICAL REVIEW B,2003,67(14). |
| APA | Sun, JR,Gao, J,Fei, Y,Li, RW,&Shen, BG.(2003).Doping effects on the phase separation in perovskite La0.67-xBixCa0.33MnO3.PHYSICAL REVIEW B,67(14). |
| MLA | Sun, JR,et al."Doping effects on the phase separation in perovskite La0.67-xBixCa0.33MnO3".PHYSICAL REVIEW B 67.14(2003). |
入库方式： OAI收割
来源：物理研究所
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