Exact diagonalization evidence shows a 12-site diamond valence bond solid phase, and a possible spin-nematic phase, in the S=1/2 kagome Heisenberg model with ferromagnetic J2 and J3 couplings.
Valence-bond crystal phase of a frustrated spin-1/2 square-lattice antiferromagnet,
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Valence bond solid and possible deconfined quantum criticality in an extended kagome lattice Heisenberg antiferromagnet
Exact diagonalization evidence shows a 12-site diamond valence bond solid phase, and a possible spin-nematic phase, in the S=1/2 kagome Heisenberg model with ferromagnetic J2 and J3 couplings.