论文标题
Muon-Spin松弛研究对晶体有机自由基化合物中的磁性双重性研究
Muon-spin relaxation investigation of magnetic bistability in a crystalline organic radical compound
论文作者
论文摘要
我们介绍了对晶体有机自由基化合物4-（2-苯二咪唑基）-1,2,3,5-二二唑基（HBIMDTDA）的晶体旋转放松（$μ^{+} $ sr）的结果11 \，\ Mathrm {K} $由结构相变引起。使用电子结构计算的MUON站点分析表明，一系列候选MUON停止位点。这些位点众多，能量相似，但在材料的两个结构阶段之间有很大的不同。尽管站点的差异有所不同，但穆恩仍然是对过渡的忠实探测，在低温结构相中揭示了动态裂开的磁性无序状态。相比之下，在高温阶段，松弛是由静态核力矩引起的，快速电子动力学从MUON光谱运动范围缩小。
We present the results of a muon-spin relaxation ($μ^{+}$SR) investigation of the crystalline organic radical compound 4-(2-benzimidazolyl)-1,2,3,5-dithiadiazolyl (HbimDTDA), in which we demonstrate the hysteretic magnetic switching of the system that takes place at $T = 274 \pm 11\,\mathrm{K}$ caused by a structural phase transition. Muon-site analysis using electronic structure calculations suggests a range of candidate muon stopping sites. The sites are numerous and similar in energy but, significantly, differ between the two structural phases of the material. Despite the difference in the sites, the muon remains a faithful probe of the transition, revealing a dynamically-fluctuating magnetically disordered state in the low-temperature structural phase. In contrast, in the high temperature phase the relaxation is caused by static nuclear moments, with rapid electronic dynamics being motionally narrowed from the muon spectra.
