Spin-lattice coupling driven ferroelectric transition in one-dimensional organic quantum magnets
文献类型：期刊论文
| 作者 | L. J. Ding ; K. L. Yao ; H. H. Fu |
| 刊名 | Journal of Materials Chemistry
 |
| 出版日期 | 2011 |
| 卷号 | 21期号:2页码:449-455 |
| 关键词 | charge-transfer complexes donor-acceptor compounds peierls transition room-temperature ionic transition phase-transition tetrathiafulvalene polymer ttf |
| ISSN号 | 0959-9428 |
| 中文摘要 | We propose a theoretical quantum spin model for a one-dimensional (1D) spin-Peierls (SP) system to describe its ferroelectricity driven by the spin-lattice coupling, and further investigate the ferroelectric (FE) SP transition for a known 1D organic donor-acceptor charge transfer compound, which was experimentally proved to show ferroelectricity, by means of many-body Green's function theory. It is found that the transition temperature (T(c)), polarization (P) and dielectric constant are in agreement with experimental results. Meanwhile, it is shown that the two-site thermal entanglement entropy is a good indicator of a FE transition. In addition, the potential magnetoelectric behavior is taken into account. On the one hand, when the magnetic field is turned on, it makes P and T(c) decrease, and drives the FE transition from the second order to the first order. Nevertheless, the FE dimerized-singlet state may collapse for high enough magnetic fields, leading to the restoration of paraelectric uniform stack of donor acceptor. On the other hand, as the electric field is applied along the chain, the FE phase is evidenced by the electric polarization (P)-field (E) hysteresis loops. It is also found that the magnetization M decreases but the polarization P can be enhanced with increasing electric field, which makes the FE transition exhibit crossover behavior, since the electrostatic energy predominates over the spin-lattice coupling. |
| 原文出处 | |
| 公开日期 | 2012-04-13 |
| 源URL | [http://210.72.142.130/handle/321006/30302]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 推荐引用方式 GB/T 7714 | L. J. Ding,K. L. Yao,H. H. Fu. Spin-lattice coupling driven ferroelectric transition in one-dimensional organic quantum magnets[J]. Journal of Materials Chemistry,2011,21(2):449-455. |
| APA | L. J. Ding,K. L. Yao,&H. H. Fu.(2011).Spin-lattice coupling driven ferroelectric transition in one-dimensional organic quantum magnets.Journal of Materials Chemistry,21(2),449-455. |
| MLA | L. J. Ding,et al."Spin-lattice coupling driven ferroelectric transition in one-dimensional organic quantum magnets".Journal of Materials Chemistry 21.2(2011):449-455. |
入库方式： OAI收割
来源：金属研究所
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