Monte Carlo study of half-magnetization plateau and magnetic phase diagram in pyrochlore antiferromagnetic Heisenberg model
Abstract
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.
- Publication:
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Journal of Magnetism and Magnetic Materials
- Pub Date:
- May 2006
- DOI:
- 10.1016/j.jmmm.2005.10.032
- arXiv:
- arXiv:cond-mat/0506500
- Bibcode:
- 2006JMMM..300...57M
- Keywords:
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- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- 6 pages, 4 figures, proceedings submitted to MISM2005