The quantum $J_1$-$J_1^{\prime }$-$J_2$ spin-1/2 Heisenberg model: Influence of the interchain coupling on the ground-state magnetic ordering in 2D

Abstract

We study the phase diagram of the 2D $J_1$-$J_1^{\prime }$-$J_2$ spin-1/2 Heisenberg model by means of the coupled cluster method. The effect of the coupling $J_1^{\prime }$ on the Neel and stripe states is investigated. We find that the quantum critical points for the Neel and stripe phases increase as the coupling strength $J_1^{\prime }$ is increased, and an intermediate phase emerges above the region at $J_1^{\prime }\approx 0.6$ when $J_1=1$. We find indications for a quantum triple point at $J_1^{\prime }\approx 0.60\pm 0.03$, $J_2\approx 0.33\pm 0.02$ for $J_1=1$.

arXiv comment12 pages, 5 figures. Changed minor contents

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