μSR study of organic systems:: ferromagnetism, antiferromagnetism, the spin-crossover effect, and fluctuations in magnetic nanodiscs

被引：13
|
作者：
Blundell, SJ
Pratt, FL
Lancaster, T
Marshall, IM
Steer, CA
Hayes, W
Sugano, T
Letard, JF
Caneschi, A
Gatteschi, D
Heath, SL
机构：
[1] Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England
[2] Rutherford Appleton Lab, ISIS, Didcot OX11 0QX, Oxon, England
[3] Meiji Gakuin Univ, Dept Chem, Totsuka Ku, Yokohama, Kanagawa 244, Japan
[4] ICMCB, Grp Sci Mol, UPR CNRS 9048, F-33608 Pessac, France
[5] Univ Florence, Dept Chem, I-50144 Florence, Italy
[6] Univ York, Dept Chem, York, N Yorkshire, England
来源：
PHYSICA B-CONDENSED MATTER | 2003年 / 326卷 / 1-4期
关键词：
organic magnet; nanodisc; quantum tunneling; molecular magnet;
D O I：
10.1016/S0921-4526(02)01688-5
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
We present the results of recent muSR experiments on a variety of novel organic and molecular magnetic systems. Muons are sensitive to local static fields and magnetic fluctuations, but can probe much more than just the onset of long-range magnetic order. We review our work on nitronyl nitroxide organic ferromagnets and anti ferromagnets. We describe a muon study of the spin-crossover phenomenon which has been studied in Fe(PM-PEA)(2)(NCS)(2), and which shows Gaussian and root-exponential muon relaxation in the high-spin and low-spin phases, respectively. Experiments on a disc-shaped molecular complex containing Fe-19 (with spin 31/2) reveal the effects of quantum tunneling of magnetization and allow an estimate of the quantum tunneling rate. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：556 / 562
页数：7
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