Spin-lattice coupling driven ferroelectric transition in one-dimensional organic quantum magnets

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	Spin-lattice coupling driven ferroelectric transition in one-dimensional organic quantum magnets
	L. J. Ding; K. L. Yao; H. H. Fu
	2011
发表期刊	Journal of Materials Chemistry
ISSN	0959-9428
卷号	21 期号:2 页码:449-455
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.
部门归属	[ding, l. j.; yao, k. l.; fu, h. h.] huazhong univ sci & technol, sch phys, wuhan 430074, peoples r china. [ding, l. j.; yao, k. l.; fu, h. h.] huazhong univ sci & technol, wuhan high magnet field ctr, wuhan 430074, peoples r china. [yao, k. l.] chinese acad sci, int ctr mat phys, shenyang 110015, peoples r china.;yao, kl (reprint author), huazhong univ sci & technol, sch phys, wuhan 430074, peoples r china;dinglinjie82@126.com klyao@mail.hust.edu.cn
关键词	Charge-transfer Complexes Donor-acceptor Compounds Peierls Transition Room-temperature Ionic Transition Phase-transition Tetrathiafulvalene Polymer Ttf
URL	查看原文
WOS记录号	WOS:000285391300024
引用统计	被引频次：12[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/30302
专题	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.

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