Hovhannisyan V V, Strečka J, Ananikian N S
A I Alikhanyan National Science Laboratory, 0036 Yerevan, Armenia.
J Phys Condens Matter. 2016 Mar 2;28(8):085401. doi: 10.1088/0953-8984/28/8/085401. Epub 2016 Feb 2.
The spin-1 Ising-Heisenberg diamond chain with the second-neighbor interaction between nodal spins is rigorously solved using the transfer-matrix method. In particular, exact results for the ground state, magnetization process and specific heat are presented and discussed. It is shown that further-neighbor interaction between nodal spins gives rise to three novel ground states with a translationally broken symmetry, but at the same time, does not increases the total number of intermediate plateaus in a zero-temperature magnetization curve compared with the simplified model without this interaction term. The zero-field specific heat displays interesting thermal dependencies with a single- or double-peak structure.
利用转移矩阵方法对具有节点自旋间次近邻相互作用的自旋 - 1伊辛 - 海森堡菱形链进行了严格求解。特别地，给出并讨论了基态、磁化过程和比热的精确结果。结果表明，节点自旋间的更远邻相互作用产生了三个具有平移对称性破缺的新型基态，但与此同时，与没有该相互作用项的简化模型相比，零温磁化曲线中的中间平台总数并未增加。零场比热呈现出具有单峰或双峰结构的有趣热依赖性。
