Phase transitions of the frustrated bilayer spin one XY model
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Universidade Federal de Minas Gerais
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Artigo de periódico
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In this paper we use the SU(3) Schwinger boson representation, followed by a mean field decoupling, to study the disordered phases of the bilayer spin one quantum XY antiferromagnet on a square lattice with next near neighbor and a single ion anisotropy. The phase diagram at zero temperature is obtained. The ratio between the interlayer to the intralayer near neighbor J1 exchange interactions exhibits a quantum phase transition at a critical ratio that separates the small- η Nèel phase from the large η quantum disordered paramagnet. The effect of next near neighbor interactions is discussed. The Neel phase is studied using a self consistent harmonic approximation that takes into account topological effects.
Abstract
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Antiferromagnetismo
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Antiferromagnet, XY model, Bilayer
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https://www.sciencedirect.com/science/article/pii/S0304885317330585