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arXiv 0903.2884cond-mat.str-el
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$s = 1/2$ kagome体系ZnCu_3(OH)_6Cl_2中的Dzyaloshinskiii-Moriya各向异性和非磁性杂质

Dzyaloshinskii-Moriya anisotropy and non-magnetic impurities in the $s = 1/2$ kagome system ZnCu_3(OH)_6Cl_2

Ioannis Rousochatzakis, Salvatore R. Manmana, Andreas M. Läuchli, Bruce Normand, Frédéric Mila

摘要:

受最近对ZnCu $_3$(OH)$_6$ Cl $_2$的核磁共振实验的启发,我们提出了一个精确对角化研究的非磁性杂质和Dzyaloshinskiii-Moriya(DM)相互作用的联合作用在$s = 1/2$ kagome反铁磁体。对外加场的局部响应和相关矩阵数据表明,$D = 0$的每个杂质周围发生的二聚体冻结至少持续到$D/J\simeq 0.06$,其中$J$和$D$分别表示交换能和DM相互作用能。在$D/J\simeq 0.1$处发生了向($Q = 0$)半经典、120 $^\circ$态的相变,该相变有利于大$D$。然而,二聚体旁边的杂质网站保持强大的值$D \sim J$,远高于这个临界点,因此不完全参与有序状态。我们讨论了我们的实验结果对ZnCu $_3$(OH)$_6$ Cl $_2$的影响。

英文摘要:

Motivated by recent nuclear magnetic resonance experiments on ZnCu$_3$(OH)$_6$Cl$_2$, we present an exact-diagonalization study of the combined effects of non-magnetic impurities and Dzyaloshinskii-Moriya (DM) interactions in the $s = 1/2$ kagome antiferromagnet. The local response to an applied field and correlation-matrix data reveal that the dimer freezing which occurs around each impurity for $D = 0$ persists at least up to $D/J\simeq 0.06$, where $J$ and $D$ denote respectively the exchange and DM interaction energies. The phase transition to the ($Q = 0$) semiclassical, 120$^\circ$ state favored at large $D$ takes place at $D/J\simeq 0.1$. However, the dimers next to the impurity sites remain strong up to values $D \sim J$, far above this critical point, and thus do not participate fully in the ordered state. We discuss the implications of our results for experiments on ZnCu$_3$(OH)$_6$Cl$_2$.

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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