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arXiv 1108.3036cond-mat.str-elcond-mat.stat-mech
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空间各向异性三角反铁磁物质中的有序性

Order in a Spatially Anisotropic Triangular Antiferromagnet

Sedigh Ghamari, Catherine Kallin, Sung-Sik Lee, Erik S. Sørensen

摘要:

利用重整化群分析研究了自旋为1/2的海森堡反铁磁体在弱耦合链的各向异性三角晶格上的相图,该模型与Cs2 CuCl 4模型有关,其中包括了与该模型的数值研究相联系的重要的边缘耦合.特别地,研究了无公度螺旋自旋密度序和共线反铁磁序的相对稳定性。虽然无公度螺旋秩序被发现存在于大多数的相图中的Dzyaloshinskiii-Moriya(DM)的相互作用的存在下,在小的链间和非常弱的DM耦合,共线反铁磁秩序可以生存。我们的研究结果意味着,Cs2 CuCl 4是很好的螺旋秩序是稳定的相图的一部分。重整化群分析的数值研究,其中许多已经发现的自旋液体的行为的影响,进行了讨论。

英文摘要:

The phase diagram of the spin-1/2 Heisenberg antiferromagnet on an anisotropic triangular lattice of weakly coupled chains, a model relevant to Cs2CuCl4, is investigated using a renormalization group analysis, which includes marginal couplings important for connecting to numerical studies of this model. In particular, the relative stability of incommensurate spiral spin-density order and collinear antiferromagnetic order is studied. While incommensurate spiral order is found to exist over most of the phase diagram in the presence of a Dzyaloshinskii-Moriya (DM) interaction, at small interchain and extremely weak DM couplings, collinear antiferromagnetic order can survive. Our results imply that Cs2CuCl4 is well within the part of the phase diagram where spiral order is stable. The implications of the renormalization group analysis for numerical studies, many of which have found spin-liquidlike behavior, are discussed.

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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