Half-magnetization plateau stabilized by structural distortion in the antiferromagnetic Heisenberg model on a pyrochlore lattice
Half-magnetization plateau stabilized by structural distortion in the antiferromagnetic Heisenberg model on a pyrochlore lattice
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DOI：
10.1103/physrevlett.93.197203
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发表时间：
2004-11-05
影响因子：
8.6
通讯作者：
Shiba, H
中科院分区：
文献类型：
--
作者：
Penc, K;Shannon, N;Shiba, H
磁化高原，在低温下可以看到磁化率的异常，是磁性受挫的标志之一。我们展示了火绿石反铁磁体中自旋和晶格自由度之间的耦合如何产生极其强大的半磁化平台，并对这种平台状态的最简单可能场景进行了详细的对称分析。讨论了该理论在尖晶石氧化物CdCr2O4和HgCr2O4上的应用，这两种氧化物均有较强的半磁化平台。
Magnetization plateaus, visible as anomalies in magnetic susceptibility at low temperatures, are one of the hallmarks of frustrated magnetism. We show how an extremely robust half-magnetization plateau can arise from coupling between spin and lattice degrees of freedom in a pyrochlore antiferromagnet and develop a detailed symmetry of analysis of the simplest possible scenario for such a plateau state. The application of this theory to the spinel oxides CdCr2O4 and HgCr2O4, where a robust half-magnetization plateau has been observed, is discussed.