Monte Carlo study of half-magnetization plateau and magnetic phase diagram in pyrochlore antiferromagnetic Heisenberg model

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:300

Article; Proceedings Paper

Motome, Y ; Penc, K ; Shannon, N

关键词: geometrical frustration;    pyrochlore lattice;    bilinear-biquadratic Heisenberg model;    magnetization plateau;    Monte Carlo simulation;   

DOI  :  10.1016/j.jmmm.2005.10.032

来源: Elsevier

【 摘 要 】

The antiferromagnetic Heisenberg model on a pyrochlore lattice tinder 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. (c) 2005 Published by Elsevier B.V.

【 授权许可】

Free