Influence of antisymmetric exchange interaction on quantum tunneling of magnetization in a dimeric molecular magnet Mn6

被引：21

作者：

Bahr, S. ^{[1
]}

Milios, C. J. ^{[2
]}

Jones, L. F. ^{[2
]}

Brechin, E. K. ^{[2
]}

Mosser, V. ^{[3
]}

Wernsdorfer, W. ^{[1
]}

机构：

[1] CNRS, Inst Neel, Assoc UJF, F-38042 Grenoble 9, France

[2] Univ Edinburgh, Sch Chem, Edinburgh EH9 3JJ, Midlothian, Scotland

[3] Itron France, F-92240 Malakoff, France

来源：

PHYSICAL REVIEW B | 2008年 / 78卷 / 13期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1103/PhysRevB.78.132401

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present magnetization measurements on the single molecule magnet Mn-6, revealing various tunnel transitions inconsistent with a giant-spin description. We propose a dimeric model of the molecule with two coupled spins S=6, which involves crystal-field anisotropy, symmetric Heisenberg exchange interaction, and antisymmetric Dzyaloshinskii-Moriya exchange interaction. We show that this simplified model of the molecule explains the experimentally observed tunnel transitions and that the antisymmetric exchange interaction between the spins gives rise to tunneling processes between spin states belonging to different spin multiplets.

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页数：4

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