GROUND-STATE PHASE-DIAGRAMS OF THE 2-DIMENSIONAL QUANTUM HEISENBERG SPIN-GLASS MODELS

被引：9

作者：

NONOMURA, Y

OZEKI, Y

机构：

[1] Department of Physics, Tokyo Institute of Technology, Meguro-ku, Tokyo 152

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1995年 / 64卷 / 08期

关键词：

QUANTUM SPIN GLASS; HEISENBERG MODEL; GROUND-STATE PHASE TRANSITION; SITE-RANDOM MODEL; EXACT DIAGONALIZATION;

D O I：

10.1143/JPSJ.64.2710

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Ground-state properties of the two-dimensional S=1/2 random Heisenberg models are investigated by the exact-diagonalization method. The phase diagram of the bond-random model (the +/- J model) is the same as that of the corresponding Ising spin glass model, in spite of quantum fluctuation. In the site-random model, the spin glass phase exists at least in the ferro-rich case. In comparison with the corresponding Ising model, the Neel phase of this model becomes much narrower in the ferro-rich case, while it is comparable in the antiferro-rich case.

引用

页码：2710 / 2713

页数：4

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