Monte Carlo study of half–magnetization plateau and magnetic phase diagram in pyrochlore antiferromagnetic Heisenberg model
نویسنده
چکیده
The antiferromagnetic Heisenberg model on a pyrochlore lattice under external magnetic field is studied by classical Monte Carlo simulation. The model includes bilinear and biquadratic interactions; the latter effectively describes the coupling to lattice distortions. The magnetization process shows a half–magnetization plateau at low temperatures, accompanied with strong suppression of the magnetic susceptibility. Temperature dependence of the plateau behavior is clarified. Finite–temperature phase diagram under the magnetic field is determined. The results are compared with recent experimental results in chromium spinel oxides.
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