有机金属交替符号链中的量子自旋相关
Quantum spin correlations in an organometallic alternating sign chain
摘要：
用高分辨非弹性中子散射研究了有机金属磁体DMACuCl $_3$的激发。描述这种材料的正确磁哈密顿量已经争论了很多年。结合高场体磁化强度和磁化率的研究，新的结果表明，DMACuCl $_3$是一个实现的$S=1/2$交替反铁磁-铁磁（AFM-FM）链。耦合簇计算用于获得交换参数，表明AFM和FM相互作用具有几乎相同的强度。散射强度的分析显示了明确的证据间二聚体自旋相关性，在现有的结果相比，传统的交替链。结果进行了讨论的背景下，最近的想法有关量子纠缠。
英文摘要：
High resolution inelastic neutron scattering is used to study excitations in the organometallic magnet DMACuCl$_3$. The correct magnetic Hamiltonian describing this material has been debated for many years. Combined with high field bulk magnetization and susceptibility studies, the new results imply that DMACuCl$_3$ is a realization of the $S=1/2$ alternating antiferromagnetic-ferromagnetic (AFM-FM) chain. Coupled-cluster calculations are used to derive exchange parameters, showing that the AFM and FM interactions have nearly the same strength. Analysis of the scattering intensities shows clear evidence for inter-dimer spin correlations, in contrast to existing results for conventional alternating chains. The results are discussed in the context of recent ideas concerning quantum entanglement.
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