2005•arXiv (Cornell University)Open access
The Union Jack model: a quantum spin model with frustration on the square lattice
Andrew M. Collins, J P McEvoy, Derek W. Robinson, C. J. Hamer, Weihong, Zheng
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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{\' e}el 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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