Spin dynamics and coherent tunnelling in the molecular magnetic rings Fe6 and Fe8

被引：35
作者：
Honecker, A
Meier, F
Loss, D
Normand, B
机构：
[1] Tech Univ Braunschweig, Inst Theoret Phys, D-38106 Braunschweig, Germany
[2] Univ Basel, Dept Phys & Astron, CH-4056 Basel, Switzerland
[3] Univ Augsburg, Inst Phys, D-86135 Augsburg, Germany
来源：
EUROPEAN PHYSICAL JOURNAL B | 2002年 / 27卷 / 04期
关键词：
D O I：
10.1140/epjb/e2002-00182-1
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
We present detailed calculations of low-energy spin dynamics in the "ferric wheel" systems Na:Fe-6 and Cs:Fe-8 in a magnetic field. We compute by exact diagonalisation the low-energy spectra and matrix elements for total-spin and Neel-vector components, and thus the time-dependent correlation functions of these operators. Comparison of our results with the semiclassical theory of coherent quantum tunnelling of the Neel vector demonstrates the validity of a two-state description for the low-energy dynamics of ferric wheels. We discuss the implications of our results for mesoscopic quantum coherent phenomena, and for the experimental techniques to observe them, in molecular magnetic rings.
引用
收藏
页码：487 / 495
页数：9
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