Complete phase diagram of the spin-1/2 -- model (with ) on the honeycomb lattice
arXiv:1202.6249 · doi:10.1103/PhysRevB.85.155135
Abstract
We use the coupled cluster method to investigate the ground-state (GS) properties of the frustrated spin-1/2 -- model on the honeycomb lattice, with nearest-neighbor exchange coupling plus next-nearest-neighbor () and next-next-nearest-neighbor () exchanges of equal strength. In particular we find a direct first-order phase transition between the Néel-ordered antiferromagnetic phase and the ferromagnetic phase at a value when , compared to the corresponding classical value of -1. We find no evidence for any intermediate phase. From this and our previous CCM studies of the model we present its full zero-temperature GS phase diagram.
arXiv comment4 pages, 4 figures
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