Coexistent quantum and classical aspects of magnetization plateaux in alternating-spin chains
Coexistent quantum and classical aspects of magnetization plateaux in alternating-spin chains
复制标题
交替自旋链中磁化平台共存的量子和经典方面
DOI：
10.1088/0953-8984/12/47/306
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
Shoji Yamamoto
中科院分区：
文献类型：
--
作者：
T. Sakai;Shoji Yamamoto
从理论上研究了交替自旋亚铁磁海森堡链的磁化过程。对（S，s）=（3/2，1）和（2，1）的有限系统进行精确对角化的尺度分析表明，当S和s>1/2时，基态磁化曲线中存在多平台结构。自发磁化中的第一个平台可以经典地解释为：起源于伊辛间隙。相反，第二个和更高的必须源于磁化的量化。它也被发现，所有的2s平台，无论是经典的和量子的，甚至出现在各向同性的情况下，没有键交替。
The processes of magnetization of ferrimagnetic Heisenberg chains of alternating spins are studied theoretically. Size-scaling analysis with the exact diagonalization of finite systems for (S,s) = (3/2,1) and (2,1) indicates a multi-plateau structure in the ground-state magnetization curve for S and s>1/2. The first plateau in the spontaneous magnetization can be explained classically: as originating from the Ising gap. In contrast, the second and higher ones must be originating from the quantization of the magnetization. It is also found that all of the 2s plateaux, both classical and quantum ones, appear even in the isotropic case with no bond alternation.