μSR studies of organic and molecular magnets
μSR studies of organic and molecular magnets
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DOI：
10.1016/s0277-5387(03)00257-2
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发表时间：
2003-07-15
期刊：
影响因子：
2.6
通讯作者：
Omerzu, A
中科院分区：
文献类型：
--
作者：
Blundell, SJ;Pratt, FL;Omerzu, A
μ子自旋旋转和弛豫（muSR）实验已经在各种新型有机和分子磁性系统上进行。在这些实验中，植入的μ子被用来研究μ子站点的局部场的大小，分布和动力学。计算的偶极场内的单位细胞的空间依赖性被用来解释的数据，并确定在某些情况下的μ子网站。我们描述和评论硝酰基氮氧化物有机铁磁体和反铁磁体的μ介子实验。我们讨论了在Fe（PM-PEA）（2）（NCS）（2）中研究的自旋交叉现象的μ子研究，并且分别在高自旋和低自旋相显示高斯和根指数μ子弛豫。高温退火对TDAE-C-60的影响也用muSR进行了研究。在含有Fe-19（自旋为31/2）的圆盘形分子复合物上的实验揭示了磁化强度波动的影响，并允许估计波动率。这些实验证明了使用muSR技术可以解决的广泛问题。(C)2003爱思唯尔科技有限公司版权所有。
Muon-spin rotation and relaxation (muSR) experiments have been performed on a variety of novel organic and molecular magnetic systems. In these experiments, implanted muons are used to study the magnitude, distribution and dynamics of the local field at the muon site. Calculations of the spatial dependence of the dipole-field inside the unit cell are used to interpret the data and determine the muon site in certain cases. We describe and review muon experiments on nitronyl nitroxide organic ferromagnets and antiferromagnets. We discuss 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. The effects of high temperature annealing on TDAE-C-60 have also been studied with muSR. Experiments on a disc-shaped molecular complex containing Fe-19 (with spin 31/2) reveal the effects of fluctuations of magnetization and allow an estimate of the fluctuation rate. These experiments demonstrate the wide range of problems which can be tackled using the muSR technique. (C) 2003 Elsevier Science Ltd. All rights reserved.