The Union Jack model: a quantum spin model with frustration on the square lattice
A. Collins, J. McEvoy, D. Robinson, C. J. Hamer, Zheng Weihong
Abstract
A new quantum spin model with frustration, the `Union Jack' model on the square lattice, is analyzed using spin-wave theory. For small values of the frustrating coupling α, the system is N\' eel ordered as usual, while for large α the frustration is found to induce a canted phase. The possibility of an intermediate spin-liquid phase is discussed.
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