Local field dynamics in a resonant quantum tunneling system of magnetic molecules

被引：0

作者：

T. Ohm

C. Sangregorio

C. Paulsen

机构：

[1] Centre de Recherches sur les Très Basses Températures (laboratoire associéà l'Université J. Fourier,

[2] Grenoble.),undefined

[3] France,undefined

[4] Department of Chemistry,undefined

[5] University of Firenze,undefined

[6] Italy,undefined

来源：

The European Physical Journal B - Condensed Matter and Complex Systems | 1998年 / 6卷

关键词：

PACS.75.45.+j Macroscopic quantum phenomena in magnetic systems-61.46.+w Clusters, nanoparticles, and nanocrystalline materials-75.60.Ej Magnetization curves,hysteresis, Barkhausen and related effects;

D O I：

暂无

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学科分类号：

摘要：

We observed non-exponential relaxation for a quantum tunneling molecular magnetic system at very low temperatures and argue that it results from evolving intermolecular dipole fields. At the very beginning of the relaxation, the magnetization follows a square-root time dependence. A simple model is developed for the intermediate time range that is in good agreement with the data over 4 decades in time. Detailed numerical calculations as well as measurements are presented which indicate unusual correlation effects in these systems.

引用

页码：195 / 199

页数：4