分子基磁体CuPOF中具极小交换耦合的极好隔离二维自旋-$1/2$反铁磁Heisenberg层
强关联电子
2020-09-02 v2
摘要
我们报道了新合成的基于Cu的分子磁体 [Cu(pz)(2-HOpy)](PF) (CuPOF) 的综合表征,其中 pz = CHN,2-HOpy = CHNHO。通过理论建模与体磁强计、比热、SR、ESR和NMR光谱结果的比较,该材料被确定为二维平方晶格 反铁磁Heisenberg模型的极佳实现,其面内最近邻交换耦合适中,为 K,而层间相互作用极小,约为 1 mK。在零场下,体磁强计揭示了自旋关联从各向同性到 类型的温度驱动交叉,这是由弱本征易平面各向异性引起的。在层间耦合影响下,由低温 各向异性驱动向长程有序的相变发生于 K,如 SR所揭示。在施加磁场下,我们的 H-NMR数据显示磁各向异性显著增强,表现为在 K 和 7 T 下向有公度长程有序的相变温度明显升高。
引用
@article{arxiv.2005.12058,
title = {Extremely well isolated 2D spin-$1/2$ antiferromagnetic Heisenberg layers with small exchange coupling in the molecular-based magnet CuPOF},
author = {D. Opherden and N. Nizar and K. Richardson and J. C. Monroe and M. M. Turnbull and M. Polson and S. Vela and W. J. A. Blackmore and P. A. Goddard and J. Singleton and E. S. Choi and F. Xiao and R. C. Williams and T. Lancaster and F. L. Pratt and S. J. Blundell and Y. Skourski and M. Uhlarz and A. N. Ponomaryov and S. A. Zvyagin and J. Wosnitza and M. Baenitz and I. Heinmaa and R. Stern and H. Kühne and C. P. Landee},
journal= {arXiv preprint arXiv:2005.12058},
year = {2020}
}
备注
14 pages, 8 figures, as well as 10 pages and 18 figures of supplemental material