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arXiv 0712.2269cond-mat.str-el
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场中各向异性Kagome晶格反铁磁体的有序相

Ordered Phases of the Anisotropic Kagome Lattice Antiferromagnet in a Field

E. M. Stoudenmire, Leon Balents

摘要:

各向异性kagome晶格上的反铁磁海森堡模型可能是真实磁系统的一个很好的极小模型,也是理解各向同性情况的一个极限。因此,我们研究了磁场中各向异性kagome晶格上最近邻的海森堡反铁磁体。这样的系统应该很好地描述弱相互作用的自旋链,我们激励的对称性考虑和微扰投影出链间自旋的相互作用的一般形式。在自旋为1/2的情况下,我们发现随着外加磁场的增加,系统呈现出从亚铁磁有序态到XY有序态的量子相变。最后,我们讨论了出现在亚铁磁阶段的磁化平台。

英文摘要:

The antiferromagnetic Heisenberg model on an anisotropic kagome lattice may be a good minimal model for real magnetic systems as well as a limit from which the isotropic case can be better understood. We therefore study the nearest-neighbor Heisenberg antiferromagnet on an anisotropic kagome lattice in a magnetic field. Such a system should be well described by weakly interacting spin chains, and we motivate a general form for the interaction by symmetry considerations and by perturbatively projecting out the inter-chain spins. In the spin 1/2 case, we find that the system exhibits a quantum phase transition from a ferrimagnetic ordered state to an XY ordered state as the field is increased. Finally, we discuss the appearance of magnetization plateaux in the ferrimagnetic phase.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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