Ground-State Phase Diagrams of the Two-Dimensional Quantum Heisenberg Spin Glass Models

Details Ground-State Phase Diagrams of the Two-Dimensional Quantum Heisenberg Spin Glass Models Ground-State Phase Diagrams of the Two-Dimensional Quantum Heisenberg Spin Glass Models

1995-08-31

arxiv.org/abs/cond-mat/9508144v1

Physics

Condensed Matter

5 pages, LaTeX, 5 postscript figures

Scientific paper

10.1143/JPSJ.64.2710

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 $\pm J$ 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 N\'eel phase of this model becomes much narrower in the ferro-rich case, while it is comparable in the antiferro-rich case. KEYWORDS: quantum spin glass, Heisenberg model, ground-state phase transition, site-random model, exact diagonalization

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