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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

cond-mat.str-elarXiv:cond-mat/0511451

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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