Spin-Peierls transition in low-dimensional quantum spin systems: a Green's function approach
文献类型：期刊论文
| 作者 | L. J. Ding ; K. L. Yao ; H. H. Fu |
| 刊名 | Physical Chemistry Chemical Physics
 |
| 出版日期 | 2009 |
| 卷号 | 11期号:48页码:11415-11423 |
| 关键词 | structural phase-transition inorganic compound cugeo3 antiferromagnetic phases magnetic-properties heisenberg chain temperature impurity |
| ISSN号 | 1463-9076 |
| 中文摘要 | We study the spin-Peierls (SP) transition of one-dimensional chain polymeric complexes coupled to lattice by means of many-body Green's function theory. The chain effective elastic constant is an intrinsic factor that determines the order of SP transition. It is found that the SP transition temperature T(SP) and the susceptibility-maximum temperature T(max) are in agreement with the experimental results. When an external magnetic field is applied to the chain, it makes T(SP) and T(max) decrease, and drives the SP transition from the second order to the first order. Besides, we show that the two-site thermal entanglement entropy is a good indicator of SP transition. Further considering the effect of interchain coupling on SP transition, with weak coupling of double-chain, the theoretical values are closer to the experimental results. We also calculate the density of states and spectral functions, which show that the energy gap vanishes at a critical temperature lower than T(SP), indicating a gapless SP phase lies in the gapped dimerized phase. The interchain coupling can drive the SP transition from the second order to the first order, while the SP dimerization may collapse for large interchain couplings. |
| 原文出处 | |
| 公开日期 | 2012-04-13 |
| 源URL | [http://210.72.142.130/handle/321006/31867]  |
| 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-Peierls transition in low-dimensional quantum spin systems: a Green's function approach[J]. Physical Chemistry Chemical Physics,2009,11(48):11415-11423. |
| APA | L. J. Ding,K. L. Yao,&H. H. Fu.(2009).Spin-Peierls transition in low-dimensional quantum spin systems: a Green's function approach.Physical Chemistry Chemical Physics,11(48),11415-11423. |
| MLA | L. J. Ding,et al."Spin-Peierls transition in low-dimensional quantum spin systems: a Green's function approach".Physical Chemistry Chemical Physics 11.48(2009):11415-11423. |
入库方式： OAI收割
来源：金属研究所
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