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Monte Carlo study of half-magnetization plateau and magnetic phase diagram in pyrochlore antiferromagnetic Heisenberg model |
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| Authors: | Yukitoshi Motome Karlo Penc Nic Shannon |
| Institution: | 1. RIKEN (The Institute of Physical and Chemical Research), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan;2. Research Institute for Solid State Physics and Optics, H-1525 Budapest, P.O.B. 49, Hungary;3. Department of Advanced Materials Science, Graduate School of Frontier Sciences, University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa, Chiba 277-8851, Japan;4. CREST, Japan Science and Technology Agency, Kawaguchi 332-0012, Japan |
| 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. |
| Keywords: | 75 10 -b" target="_blank">gif" overflow="scroll"> |
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