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arXiv 1806.03074cond-mat.str-el
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Vesignieite:一个具有第三邻交换的$S = \frac{1}{2}$ kagome反铁磁体

Vesignieite: a $S = \frac{1}{2}$ kagome antiferromagnet with dominant third-neighbor exchange

D. Boldrin, B. Fåk, E. Canévet, J. Ollivier, H. C. Walker, P. Manuel, D. Khalyavin, A. S. Wills

摘要:

自旋- $\frac{1}{2}$ kagome反铁磁体是一个典型的阻挫系统,被预测拥有各种奇异的磁态。我们表明,使用中子散射测量,氘vesignieite BaCu $_{3}$ V $_{2}$ O $_{8}$(OD)$_{2}$,一个完全化学计量的$S=1/2$戈薇磁铁与$<$ 1%的晶格畸变,磁顺序在$T_{\mathrm{N}}=9$ K到一个多k共面变体的预测三k八面体结构。我们发现这种结构是稳定的占主导地位的反铁磁3 $^{\mathrm{rd}}$ -邻居交换$J_3$与次要的1 $^{\mathrm{st}}$ -或2 $^{\mathrm{nd}}$ -邻居交换。自旋波谱很好地描述了一个$J_3$ -只有模型,包括一个微小的对称交换各向异性。

英文摘要:

The spin-$\frac{1}{2}$ kagome antiferromagnet is an archetypal frustrated system predicted to host a variety of exotic magnetic states. We show using neutron scattering measurements that deuterated vesignieite BaCu$_{3}$V$_{2}$O$_{8}$(OD)$_{2}$, a fully stoichiometric $S=1/2$ kagome magnet with $<$1% lattice distortion, orders magnetically at $T_{\mathrm{N}}=9$K into a multi-k coplanar variant of the predicted triple-k octahedral structure. We find this structure is stabilized by a dominant antiferromagnetic 3$^{\mathrm{rd}}$-neighbor exchange $J_3$ with minor 1$^{\mathrm{st}}$- or 2$^{\mathrm{nd}}$--neighbour exchange. The spin-wave spectrum is well described by a $J_3$-only model including a tiny symmetric exchange anisotropy.

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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