Magnetic coupling in the insulating and metallic ferromagnetic La1-xCaxMnO3
文献类型：期刊论文
| 作者 | Dai, PC ; Fernandez-Baca, JA ; Plummer, EW ; Tomioka, Y ; Tokura, Y |
| 刊名 | PHYSICAL REVIEW B
 |
| 出版日期 | 2001 |
| 卷号 | 64期号:22 |
| 关键词 | DOUBLE-EXCHANGE MODEL DOPED MANGANITES SPIN-DIFFUSION LA1-XSRXMNO3 TRANSITION POLARON EXCITATION CROSSOVER DYNAMICS WAVES |
| ISSN号 | 1098-0121 |
| 通讯作者 | Dai, PC (reprint author), Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. |
| 中文摘要 | Low-energy spin excitations play an essential role in determining the characteristics of the phase transitions in the colossal magnetoresistant manganese-oxides (manganites). Inelastic neutron scattering has been utilized to study the spin excitations of the ferromagnetic (FM) La1-xCaxMnO3 (LCMO) as a function of hole doping x (0.2, 0.25, and 0.30) and temperature, above and below the Curie temperature Tc. While the spin-diffusion coefficients Lambda (T) and T-c's increase smoothly with doping concentration x, the spin-stiffness constant D(T) for the insulating LCMO is 3 times smaller than that of the metallic LCMO. Furthermore, the paramagnetic-to-ferromagnetic phase transitions in LCMO manganites investigated have nonvanishing extrapolated values of D(T) as T --> T-c and nondiverging spin-correlation lengths at Tc. These results present a serious challenge to the understanding of these materials using models such as Heisenberg ferromagnetism, double exchange, or modified double exchange. |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2014-02-20 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/57885]  |
| 专题 | 物理研究所_所内人员在其他单位发表论文题录信息_所内人员在其他单位发表论文题录信息_期刊论文 |
| 推荐引用方式 GB/T 7714 | Dai, PC,Fernandez-Baca, JA,Plummer, EW,et al. Magnetic coupling in the insulating and metallic ferromagnetic La1-xCaxMnO3[J]. PHYSICAL REVIEW B,2001,64(22). |
| APA | Dai, PC,Fernandez-Baca, JA,Plummer, EW,Tomioka, Y,&Tokura, Y.(2001).Magnetic coupling in the insulating and metallic ferromagnetic La1-xCaxMnO3.PHYSICAL REVIEW B,64(22). |
| MLA | Dai, PC,et al."Magnetic coupling in the insulating and metallic ferromagnetic La1-xCaxMnO3".PHYSICAL REVIEW B 64.22(2001). |
入库方式： OAI收割
来源：物理研究所
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