Liu Mingyang, Ouyang Zhongwen, Liu Xiaochen, Cao Jiaojiao, Xiao Tongtong, Xia Zhengcai, Wang Zhenxing
Wuhan National High Magnetic Field Center & School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China.
Inorg Chem. 2022 Sep 26;61(38):15045-15050. doi: 10.1021/acs.inorgchem.2c02001. Epub 2022 Sep 13.
Isolated large-spin Heisenberg antiferromagnetic uniform chain is quite rare. Here, we have successfully synthesized an ideal one-dimensional (1D) = 5/2 linear-chain antiferromagnet [CNH][Fe(SO)], which crystallizes in a trigonal lattice with the space group 3. A broad maximum at = 18 K is observed in the magnetic susceptibility curve. Notably, no long-range magnetic ordering is observed down to 2 K even if the material has a large Curie-Weiss temperature of θ = -25.5 K. High-field magnetization at 2 K shows a linear increase until saturation at 30 T, and a high-field electron spin resonance (ESR) reveals the absence of a zero-field spin gap. The intrachain interaction and interchain interaction ' are determined. Quite a small ratio of '/ < 2.5 × 10 suggests that [CNH][Fe(SO)] behaves as an ideal 1D uniform linear-chain antiferromagnet, in which the magnetic ordering is prevented by the extremely small interchain interaction and quantum fluctuation even for a classical spin of = 5/2.
孤立的大自旋海森堡反铁磁均匀链相当罕见。在此，我们成功合成了一种理想的一维（1D）S = 5/2线性链反铁磁体[CNH][Fe(SO)]，它结晶于具有空间群R3的三角晶格中。在磁化率曲线中观察到在T = 18 K处有一个宽的最大值。值得注意的是，即使该材料具有大的居里 - 外斯温度θ = -25.5 K，直至2 K都未观察到长程磁有序。2 K时的高场磁化强度显示在30 T时线性增加直至饱和，并且高场电子自旋共振（ESR）表明不存在零场自旋能隙。确定了链内相互作用J和链间相互作用J'。相当小的J'/J < 2.5×10表明[CNH][Fe(SO)]表现为理想的1D均匀线性链反铁磁体，其中即使对于经典自旋S = 5/2，磁有序也因极小的链间相互作用和量子涨落而受到抑制。
