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Magnetic phase diagram of a spatially anisotropic, frustrated spin-1/2Heisenberg antiferromagnet on a stacked square lattice is investigated usingsecond-order spin-wave expansion. The effects of interlayer coupling and thespatial anisotropy on the magnetic ordering of two ordered ground states areexplicitly studied. It is shown that with increase in next nearest neighborfrustration the second-order corrections play a significant role in stabilizingthe magnetization. We obtain two ordered magnetic phases (Neel and stripe)separated by a paramagnetic disordered phase. Within second-order spin-waveexpansion we find that the width of the disordered phase diminishes withincrease in the interlayer coupling or with decrease in spatial anisotropy butit does not disappear. Our obtained phase diagram differs significantly fromthe phase diagram obtained using linear spin-wave theory.

Magnetic phase diagram of spatially anisotropic, frustrated spin-1/2 Heisenberg antiferromagnet on a stacked square lattice