Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-06-20
J. Mag. Mag. Mater. 300, 57 (2006)
Physics
Condensed Matter
Strongly Correlated Electrons
6 pages, 4 figures, proceedings submitted to MISM2005
Scientific paper
10.1016/j.jmmm.2005.10.032
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.
Motome Yukitoshi
Penc Karlo
Shannon Nic
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