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The ground state ofspin- ½ Heisenberg ferromagnetic chains coupled by antiferromagnetic interactions on a honeycomb lattice, which describe properties of 2-iodo, 2-bromo and 2-cyclopropyl nitronyl nitroxides, is studied by mean-field approximations with the help of numerical diagonalizations. We obtain the critical ratio of the ferromagnetic interaction to the antiferromagnetic one between ordered...
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