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Mean-field ground-state energy per site for a partial effective model describing the low-energy physics of S = 1/2 spin-dimer antiferromagnets known to display supersolid phases under an applied magnetic field. [J.-D. Picon, A. F. Albuquerque, K. P. Schmidt, N. Laflorencie, M. Troyer, and F. Mila, Phys. Rev. B 78, 184418 (2008)] |


