Anisotropic easy axis S=1 antiferromagnetic Heisenberg model with competitive interaction on a square lattice

Using a modified spin wave theory, we study the two-dimensional spin S=1 Heisenberg antiferromagnet with both spin and spatial anisotropies and competitive next-nearest neighbor interaction J2, at zero temperature. The magnetization as a function of J2 shows the existence of three different phases n...

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Bibliographic Details
Published in:Solid state communications 2014-09, Vol.193, p.56-60
Main Author: Pires, A.S.T.
Format: Article
Language:English
Subjects:
A. Antiferromagnet
Condensed matter: electronic structure, electrical, magnetic, and optical properties
D. Frustration
D. Quantum phase transitions
Exact sciences and technology
General theory and models of magnetic ordering
Magnetic properties and materials
Physics
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Summary:Using a modified spin wave theory, we study the two-dimensional spin S=1 Heisenberg antiferromagnet with both spin and spatial anisotropies and competitive next-nearest neighbor interaction J2, at zero temperature. The magnetization as a function of J2 shows the existence of three different phases namely, ordered Néel, disordered and ordered collinear phases. The existence of the disordered phase depends on the values of the anisotropy parameters. The model shows a very rich phase diagram. •The staggered magnetization as a function of the frustration is calculated for the Nèel and Collinear phases.•The phase diagrams at zero temperature are presented.•A disordered phase dependent on the values of the anisotropy parameters was found.
ISSN:0038-1098
1879-2766
DOI:10.1016/j.ssc.2014.05.028