Crossover from itinerant-electron to localized-electron behavior in Sr1-xCaxCrO3 perovskite solid solution
文献类型：期刊论文
| 作者 | Long, YW ; Yang, LX ; Lv, YX ; Liu, QQ ; Jin, CQ ; Zhou, JS ; Goodenough, JB |
| 刊名 | JOURNAL OF PHYSICS-CONDENSED MATTER
 |
| 出版日期 | 2011 |
| 卷号 | 23期号:35 |
| 关键词 | MAGNETIC-PROPERTIES HIGH-PRESSURE CACRO3 OXIDES |
| ISSN号 | 0953-8984 |
| 通讯作者 | Long, YW: Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China. |
| 中文摘要 | Polycrystalline samples of the perovskite family Sr1-xCaxCrO3 have been prepared at high pressure and temperature in steps of 1/6 over the range 0 <= x <= 1. Rietveld analysis shows a series of structural phase transitions from cubic to tetragonal to orthorhombic with increasing x. The cubic samples have no long-range magnetic order; the other samples become antiferromagnetically ordered below a T-N that increases with x. At ambient pressure, the electric transport properties of the cubic and tetragonal phases are semiconducting with a small (meV range) activation energy that increases with x; the orthorhombic phase exhibits variable-range hopping rather than the small-polaron behavior typically found for mixed-valent, localized-electron configurations. Above a pressure P = P-C, a smooth insulator-metal transition is found at a T-IM that decreases with increasing P for a fixed x; P-C increases with x. These phenomena are rationalized qualitatively with a pi*-band model having a width W-pi that approaches crossover from itinerant-electron to localized-electron behavior as W-pi decreases with increasing x. The smaller size of the Ca2+ ion induces the structural changes and the greater acidity of the Ca2+ ion is primarily responsible for narrowing W-pi as x increases. |
| 收录类别 | SCI |
| 资助信息 | NSF; MOST of China; NSF of the US; Robert A Welch Foundation of Houston, TX [F-1066] |
| 语种 | 英语 |
| 公开日期 | 2013-09-17 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/35316]  |
| 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 | Long, YW,Yang, LX,Lv, YX,et al. Crossover from itinerant-electron to localized-electron behavior in Sr1-xCaxCrO3 perovskite solid solution[J]. JOURNAL OF PHYSICS-CONDENSED MATTER,2011,23(35). |
| APA | Long, YW.,Yang, LX.,Lv, YX.,Liu, QQ.,Jin, CQ.,...&Goodenough, JB.(2011).Crossover from itinerant-electron to localized-electron behavior in Sr1-xCaxCrO3 perovskite solid solution.JOURNAL OF PHYSICS-CONDENSED MATTER,23(35). |
| MLA | Long, YW,et al."Crossover from itinerant-electron to localized-electron behavior in Sr1-xCaxCrO3 perovskite solid solution".JOURNAL OF PHYSICS-CONDENSED MATTER 23.35(2011). |
入库方式： OAI收割
来源：物理研究所
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