Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-05-15
J. Phys.: Condens. Matter 20 (2008) 255251
Physics
Condensed Matter
Strongly Correlated Electrons
12 pages, 5 figures. Changed minor contents
Scientific paper
10.1209/0295-5075/83/47004
We study the phase diagram of the 2D $J_1$-$J_1'$-$J_2$ spin-1/2 Heisenberg model by means of the coupled cluster method. The effect of the coupling $J_1'$ 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 $J_1'$ is increased, and an intermediate phase emerges above the region at $J_1' \approx 0.6$ when $J_1=1$. We find indications for a quantum triple point at $J_1' \approx 0.60 \pm 0.03$, $J_2 \approx 0.33 \pm 0.02$ for $J_1=1$.
Bishop Raymond F.
Darradi Rachid
Li P. H. Y.
Richter Jadwiga
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