论文标题
Cu5-NIPA样分子纳米磁体的基态和热力学特性的研究
Study of the ground state and thermodynamic properties of Cu5-NIPA-like molecular nanomagnets
论文作者
论文摘要
通过精确的对角度研究，研究了cu $ _5 $五聚体分子的空间各向异性旋转1/2 Heisenberg模型的热力学特性。有限晶格的基本几何形状是在纳米分子上定义的，该纳米分子由两个转角共享的斜角三角形的沙漏结构组成，这些结构与反转对称性相关。该微观磁模型非常适合描述分子纳米磁化合物Cu5-NIPA。地基相图以及相应的总磁化是作为各向异性交换相互作用和外部磁场的函数获得的。还研究了该模型在有限温度下的热力学行为，并分析了哈密顿参数的各种值的相应磁性效应。
The thermodynamic properties of a spatially anisotropic spin-1/2 Heisenberg model for a Cu$_5$ pentameric molecule is studied through exact diagonalization. The elementary geometry of the finite lattice is defined on nanomolecules consisting of an hourglass structure of two corner-sharing scalene triangles which are related by inversion symmetry. This microscopic magnetic model is quite suitable to describe the molecular nanomagnetic compound Cu5-NIPA. The ground-state phase diagram, as well as the corresponding total magnetization, are obtained as a function of the anisotropic exchange interactions and the external magnetic field. The thermodynamic behavior of the model at finite temperatures is also studied and the corresponding magnetocaloric effects are analyzed for various values of the Hamiltonian parameters.
