Unusual Electronic Structure and Observation of Dispersion Kink in CeFeAsO Parent Compound of FeAs-based Superconductors
文献类型：期刊论文
| 作者 | Liu, HY ; Chen, GF ; Zhang, WT ; Zhao, L ; Liu, GD ; Xia, TL ; Jia, XW ; Mu, DX ; Liu, SY ; He, SL ; Peng, YY ; He, JF ; Chen, ZY ; Dong, XL ; Zhang, J ; Wang, GL ; Zhu, Y ; Xu, ZY ; Chen, CT ; Zhou, XJ |
| 刊名 | PHYSICAL REVIEW LETTERS
 |
| 出版日期 | 2010 |
| 卷号 | 105期号:2 |
| 关键词 | IRON ORDER |
| ISSN号 | 0031-9007 |
| 通讯作者 | Zhou, XJ (reprint author), Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Natl Lab Superconduct, Beijing 100190, Peoples R China. |
| 中文摘要 | Whether or not a large ferroelectric polarization P exists in the orthorhombic HoMnO3 with E-type antiferromagnetic spin ordering remains one of the unresolved, challenging issues in the physics of multiferroics. The issue is closely linked to an intriguing experimental difficulty in determining the P of polycrystalline specimens, namely that conventional pyroelectric current measurements performed after a poling procedure under high dc electric fields are subject to large errors due to the problems caused by leakage currents or space charges. To overcome the difficulty, we employed the positive-up negative-down (PUND) method, which uses successively the two positive and two negative electrical pulses, to directly measure electrical hysteresis loops in several polycrystalline HoMnO3 specimens below their Neel temperatures. We found that all the HoMnO3 samples had similar remnant polarization P-r values at each temperature, regardless of their variation in resistivity, dielectric constant and pyroelectric current levels. Moreover, the P-r value of similar to 0.07 mu C cm(-2) at 6K is consistent with the P value obtained from the pyroelectric current measurement performed after a short pulse poling. Our findings suggest that the intrinsic P of polycrystalline HoMnO3 can be determined through the PUND method and P at 0K may reach similar to 0.24 mu C cm(-2) in a single crystalline specimen. This P value is still much smaller than the theoretically predicted one but is one of the largest observed in magnetism induced ferroelectrics. |
| 收录类别 | SCI |
| 资助信息 | NSFC, MOST of China [2006CB601002, 2006CB921302, 2009CB929101]; CAS |
| 语种 | 英语 |
| 公开日期 | 2013-09-23 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/46439]  |
| 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 | Liu, HY,Chen, GF,Zhang, WT,et al. Unusual Electronic Structure and Observation of Dispersion Kink in CeFeAsO Parent Compound of FeAs-based Superconductors[J]. PHYSICAL REVIEW LETTERS,2010,105(2). |
| APA | Liu, HY.,Chen, GF.,Zhang, WT.,Zhao, L.,Liu, GD.,...&Zhou, XJ.(2010).Unusual Electronic Structure and Observation of Dispersion Kink in CeFeAsO Parent Compound of FeAs-based Superconductors.PHYSICAL REVIEW LETTERS,105(2). |
| MLA | Liu, HY,et al."Unusual Electronic Structure and Observation of Dispersion Kink in CeFeAsO Parent Compound of FeAs-based Superconductors".PHYSICAL REVIEW LETTERS 105.2(2010). |
入库方式： OAI收割
来源：物理研究所
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