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arXiv 1910.02585cond-mat.str-el
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畸变金刚石自旋链的磁化平台

Magnetization Plateau of the Distorted Diamond Spin Chain

Yuki Ueno, Tomosuke Zenda, Yuta Tachibana, Kiyomi Okamoto, Tôru Sakai

摘要:

利用有限尺寸团簇的数值对角化和能级谱分析,研究了扭曲金刚石链晶格上的量子自旋阻挫系统。在以前的工作中,该系统被揭示出表现出1/3磁化平台,由于两个不同的机制取决于耦合参数,并在1/3磁化的相图得到。在目前的工作中,它被发现,1/3磁化平台消失足够大的$XY$样耦合各向异性。给出了基于能级谱分析的相图。

英文摘要:

The frustrated quantum spin system on the distorted diamond chain lattice is investigated using the numerical diagonalization of finite-size clusters and the level spectroscopy analysis. In the previous work this system was revealed to exhibit the 1/3 magnetization plateau due to two different mechanisms depending on the coupling parameters, and the phase diagram at the 1/3 magnetization was obtained. In the present work it is found that the 1/3 magnetization plateau vanishes for sufficiently large $XY$-like coupling anisotropy. The phase diagram based on the level spectroscopy analysis is also presented.

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