Abstract
The magnetic phase diagram of a spatially anisotropic, frustrated spin- Heisenberg antiferromagnet on a stacked square lattice is investigated using asecond-order spin-wave expansion. The effects of interlayer coupling and the spatialanisotropy on the magnetic ordering of two ordered ground states are explicitly studied. Itis shown that with increase in next nearest neighbor frustration the second-ordercorrections play a significant role in stabilizing the magnetization. We obtain twoordered magnetic phases (Néel and stripe) separated by a paramagnetic disorderedphase. Within the second-order spin-wave expansion we find that the width of thedisordered phase diminishes with increase in the interlayer coupling or with decreasein spatial anisotropy but it does not disappear. Our obtained phase diagramdiffers significantly from the phase diagram obtained using linear spin-wave theory.
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