论文标题
观察来自混合旋转铁磁链的热力学
Observation of thermodynamics originating from a mixed-spin ferromagnetic chain
论文作者
论文摘要
我们提出了形成混合旋转铁磁链的模型化合物。我们的材料设计基于有机自由基，提供了基于Verdazyl的复合物（P-PY-V）2 [Mn（HFAC）2]。化合物的分子轨道计算表明形成了混合自旋（1/2、1/2、5/2）铁磁链的形成。磁化率的温度依赖性揭示了其铁磁行为。磁比热的热量表现出双峰结构，并指示在低温峰处的相变。使用量子蒙特卡洛计算来解释观察到的特征。此外，修饰的自旋波理论验证了特定热的双峰结构是否显着反映了声激发带和光激发差距的相对评分。
We present a model compound that forms a mixed-spin ferromagnetic chain. Our material design, based on the organic radicals, affords a verdazyl-based complex (p-Py-V)2[Mn(hfac)2]. The molecular orbital calculations of the compound indicate the formation of a mixed spin-(1/2, 1/2, 5/2) ferromagnetic chain. The temperature dependence of magnetic susceptibility reveals its ferromagnetic behavior. The magnetic specific heat exhibits a double-peak structure and indicates a phase transition at the low-temperature peak. The observed characteristics are explained using the quantum Monte Carlo calculations. Furthermore, the modified spin-wave theory verifies that the double-peak structure of the specific heat significantly reflects the relative ration of the acoustic excitation band and the optical excitation gap.
