Low-energy excitations and thermodynamical properties of the quantum (5/2, 1/2, 1/2) ferrimagnetic chain
Low-energy excitations and thermodynamical properties of the quantum (5/2, 1/2, 1/2) ferrimagnetic chain
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量子（5/2、1/2、1/2）亚铁磁链的低能激发和热力学性质
DOI：
10.1088/0953-8984/14/34/325
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
K. Inoue
中科院分区：
文献类型：
--
作者：
A. Ovchinnikov;I. G. Bostrem;V. Sinitsyn;A. Boyarchenkov;N. Baranov;K. Inoue
从理论上研究了由（5/2，1/2，1/2）三聚体组成的量子亚铁磁海森堡链的低能结构.将线性自旋波理论的结果与精确对角化数值计算和最低光学模的矩阵乘积方法的结果进行了比较。在修正的自旋波理论框架下，分析了磁化率、比热和熵等物理性质的温度行为。计算结果用于解释一维链状结构分子基异自旋磁体[Mn（hfac）2BNOR ]（R = H，F，Cl，Br）的实验数据。
The low-energy structures of the quantum ferrimagnetic Heisenberg chain consisting of (5/2, 1/2, 1/2) trimers are investigated theoretically. The results of the linear spin-wave theory are compared with those from the numerical exact diagonalization calculation and the matrix product method for the lowest optical mode. The temperature behaviour of thermodynamical properties such as magnetic susceptibility, specific heat and entropy are analysed in the framework of the modified spin-wave theory. The results of the calculations are used to explain the experimental data obtained for the molecule-based heterospin magnets [Mn(hfac)2BNOR ] (R = H, F, Cl, Br) with one-dimensional chain structure.