arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.01670cond-mat.str-elcond-mat.mtrl-sci
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阻挫反铁磁体Gd2Ti2O7的部分磁序性质

Nature of Partial Magnetic Order in the Frustrated Antiferromagnet Gd2Ti2O7

Joseph A. M. Paddison, Georg Ehlers, Andrew B. Cairns, Jason S. Gardner, Oleg A. Petrenko, Nicholas P. Butch, Dmitry D. Khalyavin, Pascal Manuel, Henry E. Fisch… 展开作者

Joseph A. M. Paddison, Georg Ehlers, Andrew B. Cairns, Jason S. Gardner, Oleg A. Petrenko, Nicholas P. Butch, Dmitry D. Khalyavin, Pascal Manuel, Henry E. Fischer, Haidong Zhou, Andrew L. Goodwin, J. Ross Stewart

摘要:

部分有序磁体不同于自旋液体和常规有序磁体,因为有序和无序共存于同一磁相中。在这里,我们确定的性质,部分序的规范阻挫烧绿石反铁磁体Gd $_2$ Ti $_{2}$ O $_{7}$。利用外加磁场下的单晶中子衍射测量、磁对称性分析、非弹性中子散射测量和自旋波模型,我们证明了它的低温磁结构包含两个传播矢量(2- $\mathbf{k}$结构),具有被抑制的有序磁矩和增强的自旋波涨落。实验结果支持了Gd $_{2}$ Ti $_{2}$ O $_{7}$中热涨落驱动有序的理论预言。

英文摘要:

Partially-ordered magnets are distinct from both spin liquids and conventional ordered magnets because order and disorder coexist in the same magnetic phase. Here, we determine the nature of partial order in the canonical frustrated pyrochlore antiferromagnet Gd$_2$Ti$_{2}$O$_{7}$. Using single-crystal neutron-diffraction measurements in applied magnetic field, magnetic symmetry analysis, inelastic neutron-scattering measurements, and spin-wave modeling, we show that its low-temperature magnetic structure involves two propagation vectors (2-$\mathbf{k}$ structure) with suppressed ordered magnetic moments and enhanced spin-wave fluctuations. Our experimental results support theoretical predictions of thermal fluctuation-driven order in Gd$_{2}$Ti$_{2}$O$_{7}$.

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