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arxiv: 1409.7070 · v3 · pith:BWJ3NGFQnew · submitted 2014-09-24 · ❄️ cond-mat.str-el

Quantum Selection of Order in an XXZ Antiferromagnet on a Kagom\'e Lattice

classification ❄️ cond-mat.str-el
keywords quantumantiferromagnetdeltakagomorderselectionsqrtaccord
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Selection of the ground state of the kagom\'e-lattice $XXZ$ antiferromagnet by quantum fluctuations is investigated by combining non-linear spin-wave and real-space perturbation theories. The two methods unanimously favor ${\bf q}=0$ over $\sqrt{3}\times\sqrt{3}$ magnetic order in a wide range of the anisotropy parameter $0\leq \Delta\leq 0.72$. Both approaches are also in an accord on the magnitude of the quantum order-by-disorder effect generated by topologically non-trivial, loop-like spin-flip processes. A tentative $S-\Delta$ phase diagram of the model is proposed.

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