各向异性自旋1海森堡二聚体磁化过程中中间平台的击穿：理论与实验
Breakdown of an intermediate plateau in the magnetization process of anisotropic spin-1 Heisenberg dimer: theory vs. experiment
摘要：
自旋-1海森堡二聚体模型的磁化过程与轴向和菱形单离子各向异性条款的特别研究与最近的实验高场测量上进行的单晶样品的同双核镍（II）化合物[Ni 2（Medpt）2（ox）（H2O）2]（ClO 4）2. 2 H2O（Medpt=甲基-双（3-氨丙基）胺）。从精确的数值对角化得到的结果揭示了一个显着的空间依赖于所施加的磁场任意但非零的单离子各向异性的磁化过程。它表明，该字段的范围，这对应于一个中间的磁化平台出现在一半的饱和磁化强度，基本上取决于单离子各向异性条款以及所施加的字段的空间取向。的中间磁化平台的故障进行了讨论长度在单离子各向异性强度。
英文摘要：
The magnetization process of the spin-1 Heisenberg dimer model with axial and rhombic single-ion anisotropy terms is particularly investigated in connection with recent experimental high-field measurements performed on the single-crystal sample of the homodinuclear nickel(II) compound [Ni2(Medpt)2(ox)(H2O)2](ClO4)2.2H2O (Medpt=methyl-bis(3-aminopropyl)amine). The results obtained from the exact numerical diagonalization reveal a striking magnetization process with a marked spatial dependence on the applied magnetic field for arbitrary but non-zero single-ion anisotropy. It is demonstrated that the field range, which corresponds to an intermediate magnetization plateau emerging at a half of the saturation magnetization, basically depends on single-ion anisotropy terms as well as a spatial orientation of the applied field. The breakdown of the intermediate magnetization plateau is discussed at length in relation to the single-ion anisotropy strength.
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