计算物理 ›› 1994, Vol. 11 ›› Issue (1): 107-112.

• 论文 • 上一篇    下一篇

准周期层状铁磁超晶格的实空间重整化群方法

刘天时, 魏国柱   

  1. 东北工学院, 沈阳 110006
  • 收稿日期:1992-08-08 修回日期:1993-01-22 出版日期:1994-03-25 发布日期:1994-03-25

REAL-SPACE RENORMALIZATION GROUP APPROACH TO QUASI-PERIODIC LAYERED FERROMAGNETIC/SUPPERLATTICES

Liu Tianshi, Wei Guozhu   

  1. Depertment of Physics, North-east University of Technology, Shenyang, 110006
  • Received:1992-08-08 Revised:1993-01-22 Online:1994-03-25 Published:1994-03-25

摘要: 本文用实空间重整化群方法讨论了准周期层状铁磁超晶格的磁自旋波,用Reduce语言推导了decimation变换公式,从而求得了局域格林函数、局域态密度和约化磁矩。发现局域态密度的带宽和约化磁矩与最近邻相互作用J1J2及格点自旋sasb密切相关。

关键词: 准周期, 实空间重整化群, 格林函数, Reduce语言

Abstract: The real-space renormalization group approach is used for quasi-periodic layered ferromagnetic super lattice in which a site with spin sa or sb,between layers the exchange energy are J1 and J2, which are arranged in quasi-periodic Fibonacci sequence, and exchange energy J0 in each layer. When J1=J2=J0, we obtained an exact decimation transformation for local magnons of layers α,β(γ) and б(τ)in the ferromagnets. Iteration of the transformation provides numerical results for the local density of states (LDOS) and the magnetization. We found the band widthes of LDOS of layers depend on J1, J2, sa adn sb.

Key words: quasi-periodic system, real-space renormalization group, Green'a function, Reduce