Nuclear spin-lattice relaxation in ferrimagnetic clusters and chains: A contrast between zero and one dimensions
Nuclear spin-lattice relaxation in ferrimagnetic clusters and chains: A contrast between zero and one dimensions
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亚铁磁簇和链中的核自旋晶格弛豫：零维和一维之间的对比
DOI：
10.1103/physrevb.68.054409
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发表时间：
2003
影响因子：
3.7
通讯作者：
Shoji Yamamoto
中科院分区：
文献类型：
--
作者：
Hiromitsu Hori;Shoji Yamamoto
受Caneschi等人合成的亚铁磁性寡聚体和链状化合物的启发，这两个组成的交替锰（II）离子和硝酰基-氮氧自由基，我们计算的核自旋晶格弛豫速率1/T1，采用最近发展的修改的自旋波理论。1/T1作为温度的函数随探测核在团簇和链中的位置而急剧变化，尽管零维的弛豫时间尺度比一维大得多。1/T1作为一个功能的应用领域在长链中形成了一个鲜明的对比，在有限的集群，发散减少fieldlike平方根的倒数在低温下，并在高温下的grammically。
Motivated by ferrimagnetic oligonuclear and chain compounds synthesized by Caneschi et al., both of which consist of alternating manganese(II) ions and nitronyl-nitroxide radicals, we calculate the nuclear spin-lattice relaxation rate 1/T 1 , employing a recently developed modified spin-wave theory. 1/T 1 as a function of temperature drastically varies with the location of probe nuclei in both clusters and chains, though the relaxation time scale is much larger in zero dimension than in one dimension. 1/T 1 as a function of an applied field in long chains forms a striking contrast to that in finite clusters, diverging with decreasing fieldlike inverse square root at low temperatures and logarithmically at high temperatures.