...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Physical review >Relaxation process in the photoinduced neutral-ionic paraelectric-ferroelectric phase transition in tetrathiafulvalene-p-chloranil
【24h】

Relaxation process in the photoinduced neutral-ionic paraelectric-ferroelectric phase transition in tetrathiafulvalene-p-chloranil

机译：四硫富瓦烯-对氯苯胺的光诱导中性离子顺电-铁电相变中的弛豫过程

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

To find characteristic properties of relaxation process in the neutral-ionic, paraelectric-ferroelectric phase transition in the charge-transfer complex, tetrathiafulvalene-p-chloranil, we investigate stochastic process in the spin 1 anisotropic Blume-Emery-Griffith model [Phys. Rev. A 4, 1071 (1971)]. We assume that spins obey the Markov process which is described by the master equation with the transfer probability 1/T exp[ -(β/2)△H], where △H is the energy difference for the transfer. We derive time-evolution equations from two standpoints. One is the mean-field approximation (MFA) and the other is an extension of the Saito-Kubo treatment to the spin 1 and anisotropic case, which improves MFA. Solving the equations numerically, we have found highly anisotropic relaxations during the neutral-ionic phase transition: the interchain ordering develops much more slowly than the intrachain one. In contrast, the ionic-neutral phase transition proceeds rather isotropically.
机译：为了找到电荷转移配合物四硫富瓦烯-对氯苯胺在中性离子，顺电-铁电相变中弛豫过程的特征，我们研究了自旋1各向异性Blume-Emery-Griffith模型中的随机过程[Phys。 Rev.A 4，1071（1971）]。我们假设自旋服从由主方程描述的马尔可夫过程，转移概率为1 / T exp [-（β/ 2）△H]，其中△H是转移的能量差。我们从两个角度推导时间演化方程。一种是平均场近似（MFA），另一种是Saito-Kubo处理扩展到自旋1和各向异性的情况，从而改善了MFA。通过数值求解方程，我们发现在中性离子相变过程中存在高度各向异性的弛豫：链间有序的发展比链内有序的发展慢得多。相反，离子-中性相变相当各向同性地进行。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号