Magnetic Field Effects in Frustrated Low-Dimensional Magnets

• Authors: B. Schmidt , M. Siahatgar , P. Thalmeier
• Languages of publication: EN

Abstracts

EN

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.

Keywords

EN

75.10.Jm; 75.30.Cr; 75.30.Ds

Discipline

• 75.30.Cr: Saturation moments and magnetic susceptibilities
• 75.30.Ds: Spin waves(for spin-wave resonance, see 76.50.+g)
• 75.10.Jm: Quantized spin models, including quantum spin frustration

• Journal: Acta Physica Polonica A
• Year: 2012
• Volume: 121
• Issue: 5-6
• Pages: 1089-1091

Dates

published

2012-05

Contributors

author

B. Schmidt

• Max-Planck-Institut für Chemische Physik fester Stoffe, 01187 Dresden, Germany

author

M. Siahatgar

• Max-Planck-Institut für Chemische Physik fester Stoffe, 01187 Dresden, Germany

author

P. Thalmeier

• Max-Planck-Institut für Chemische Physik fester Stoffe, 01187 Dresden, Germany

References

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Identifiers

DOI

10.12693/APhysPolA.121.1089