Garlatti E, Allodi G, Bordignon S, Bordonali L, Timco G A, Winpenny R E P, Lascialfari A, De Renzi R, Carretta S
Dipartimento di Science Matematiche, Fisiche e Informatiche, Università di Parma, Parco Area delle Scienze 7/A, 43124 Parma, Italy.
J Phys Condens Matter. 2020 Jun 3;32(24):244003. doi: 10.1088/1361-648X/ab7872.
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-NMR spectra of the CrCd ring to study the local spin densities on the Cr sites. CrCd 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 = -12.7 T μ . Moreover, these NMR results confirm the theoretically predicted non-collinear spin arrangement along the CrCd ring, which is typical of an even-open AF spin chain.
对有限反铁磁（AF）自旋链进行精确的实验表征对于控制和操纵其磁特性及量子态以用于自旋电子学或量子计算的潜在应用至关重要。特别是，有限AF链预计会根据其长度和拓扑结构表现出不同的磁行为。分子AF环能够将AF链的量子磁行为与它们拓扑和几何性质的非常显著的可调性相结合。在这项工作中，我们测量了CrCd环的Cr-NMR光谱以研究Cr位点上的局部自旋密度。事实上，CrCd可以被视为具有偶数个自旋的有限AF开放链的模型系统。通过假设核心极化场A = -12.7 T μ ，NMR共振频率与理论局部自旋密度高度吻合。此外，这些NMR结果证实了理论预测的沿CrCd环的非共线自旋排列，这是偶数开放AF自旋链的典型特征。
