Breaking the ring: 53Cr-NMR on the Cr8Cd molecular nanomagnet
Breaking the ring: 53Cr-NMR on the Cr8Cd molecular nanomagnet
复制标题
DOI：
10.1088/1361-648x/ab7872
复制
发表时间：
2020-06-03
影响因子：
2.7
通讯作者：
Carretta, S.
中科院分区：
文献类型：
--
作者：
Garlatti, E.;Allodi, G.;Carretta, S.
有限反铁磁(AF)自旋链的精确实验表征对于控制和操纵其磁性和量子态在自旋电子学或量子计算中的潜在应用至关重要。特别是，有限的AF链预计会根据它们的长度和拓扑表现出不同的磁性行为。分子AF环能够将AF链的量子磁性行为与其拓扑和几何性质的可调性结合起来。在这项工作中，我们测量了Cr8Cd环的Cr-53-核磁共振谱，以研究Cr位上的局域自旋密度。Cr8Cd实际上可以被认为是一个自旋数目为偶数的有限AF开链的模型系统。假设核心极化场A(C)=-12.7Tu(-1)(B)，核磁共振共振频率与理论局域自旋密度符合得很好。此外，这些核磁共振结果证实了理论上预测的沿Cr8Cd环的非共线自旋排列，这是典型的偶数开放的AF自旋链。
An accurate experimental characterization of finite antiferromagnetic (AF) spin chains is crucial for controlling and manipulating their magnetic properties and quantum states for potential applications in spintronics or quantum computation. In particular, finite AF chains are expected to show a different magnetic behaviour depending on their length and topology. Molecular AF rings are able to combine the quantum-magnetic behaviour of AF chains with a very remarkable tunability of their topological and geometrical properties. In this work we measure the Cr-53-NMR spectra of the Cr8Cd ring to study the local spin densities on the Cr sites. Cr8Cd can in fact be considered a model system of a finite AF open chain with an even number of spins. The NMR resonant frequencies are in good agreement with the theoretical local spin densities, by assuming a core polarization field A(C) = -12.7 T mu(-1)(B). Moreover, these NMR results confirm the theoretically predicted non-collinear spin arrangement along the Cr8Cd ring, which is typical of an even-open AF spin chain.