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Magnetic Field Effects in Frustrated Low-Dimensional Magnets

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Schmidt B., Siahatgar M., Thalmeier P.

Acta Physica Polonica A

2012

vol. 121

issue 5-6

1089-1091

We investigate the frustrated two-dimensional S = 1/2 next nearest neighbor anisotropic Heisenberg antiferromagnet on a square lattice as described by the J_{1a,b} - J_2 model. We use spin-wave theory and exact diagonalization for finite tiles including a new method for the finite size scaling procedure. We present results obtained from the extension of our numerical method to finite magnetic fields as well as from spin-wave theory. The induced uniform and the staggered moment in the antiferromagnetically ordered phases in the presence of a magnetic field are calculated. They deviate strongly from classical behaviour depending on frustration ratio J_2/J_{1a,b} and the J_{1a,b} exchange anisotropy. The magnetization becomes strongly nonlinear and is suppressed from the classical value. This is due to enhanced quantum fluctuations already at moderate frustration.

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1 Acta Physica Polonica A

1 2012

1 Schmidt B.

1 Siahatgar M.

1 Thalmeier P.

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Magnetic Field Effects in Frustrated Low-Dimensional Magnets