The effect of internal pressure on the tetragonal to monoclinic structural phase transition in ReOFeAs: the case of NdOFeAs
文献类型：期刊论文
| 作者 | Fratini, M ; Caivano, R ; Puri, A ; Ricci, A ; Ren, ZA ; Dong, XL ; Yang, J ; Lu, W ; Zhao, ZX ; Barba, L ; Arrighetti, G ; Polentarutti, M ; Bianconi, A |
| 刊名 | SUPERCONDUCTOR SCIENCE & TECHNOLOGY
 |
| 出版日期 | 2008 |
| 卷号 | 21期号:9 |
| 关键词 | LAYERED QUATERNARY COMPOUND CRYSTAL-STRUCTURE CRITICAL-POINT SUPERCONDUCTIVITY LAO1-XFXFEAS |
| ISSN号 | 0953-2048 |
| 通讯作者 | Fratini, M (reprint author), Univ Roma La Sapienza, Dipartimento Fis, Piazzale Aldo Moro 2, I-00185 Rome, Italy. |
| 中文摘要 | We report the temperature dependent x-ray powder diffraction of the quaternary compound NdOFeAs (also called NdFeAsO) in the range between 300 and 95 K. We have detected the structural phase transition from the tetragonal phase, with P4/nmm space group, to the orthorhombic or monoclinic phase, with Cmma or P112/n (or P2/c) space group, over a broad temperature range from 150 to 120 K, centered at T(0) similar to 137 K. Therefore the temperature of this structural phase transition is strongly reduced, by about similar to 30 K, by increasing the internal chemical pressure going from LaOFeAs to NdOFeAs. In contrast, the superconducting critical temperature increases from 27 to 51 K going from LaOFeAs to NdOFeAs doped samples. This result shows that the normal striped orthorhombic Cmma phase competes with the superconducting tetragonal phase. Therefore by controlling the internal chemical pressure in new materials it should be possible to push toward zero the critical temperature T(0) of the structural phase transition, giving the striped phase, in order to get superconductors with higher T(c). |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2013-09-23 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/45041]  |
| 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 | Fratini, M,Caivano, R,Puri, A,et al. The effect of internal pressure on the tetragonal to monoclinic structural phase transition in ReOFeAs: the case of NdOFeAs[J]. SUPERCONDUCTOR SCIENCE & TECHNOLOGY,2008,21(9). |
| APA | Fratini, M.,Caivano, R.,Puri, A.,Ricci, A.,Ren, ZA.,...&Bianconi, A.(2008).The effect of internal pressure on the tetragonal to monoclinic structural phase transition in ReOFeAs: the case of NdOFeAs.SUPERCONDUCTOR SCIENCE & TECHNOLOGY,21(9). |
| MLA | Fratini, M,et al."The effect of internal pressure on the tetragonal to monoclinic structural phase transition in ReOFeAs: the case of NdOFeAs".SUPERCONDUCTOR SCIENCE & TECHNOLOGY 21.9(2008). |
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来源：物理研究所
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