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arXiv 2005.04228cond-mat.str-el
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高磁场下RuCl$_3$中的标度不变磁各向异性

Scale-invariant magnetic anisotropy in RuCl$_3$ at high magnetic fields

K. A. Modic, Ross D. McDonald, J. P. C. Ruff, Maja D. Bachmann, You Lai, Johanna C. Palmstrom, David Graf, Mun Chan, F. F. Balakirev, J. B. Betts, G. S. Boebing… 展开作者

K. A. Modic, Ross D. McDonald, J. P. C. Ruff, Maja D. Bachmann, You Lai, Johanna C. Palmstrom, David Graf, Mun Chan, F. F. Balakirev, J. B. Betts, G. S. Boebinger, Marcus Schmidt, D. A. Sokolov, Philip J. W. Moll, B. J. Ramshaw, Arkady Shekhter

AI总结:

该研究通过测量RuCl$_3$的磁致旋光系数,发现磁场与温度竞争决定磁响应且与交换能无关,揭示标度不变磁各向异性,为自旋液体态形成提供证据。

摘要:

在RuCl$_3$中,非弹性中子散射和拉曼光谱揭示出持续到高温的非自旋波激发连续谱,这表明在蜂窝晶格上可能存在自旋液体态。在Kitaev模型的背景下,磁场会在基本激发之间引入有限相互作用,因此必须探索与自旋交换能量尺度相当的高磁场效应。这里我们报告了在宽磁场和温度范围内对磁致旋光系数(自由能对磁场方向的二阶导数)的测量。我们发现磁场和温度相互竞争以决定磁响应,其方式与大的本征交换相互作用能无关。这种涌现的标度不变磁各向异性为高度交换阻挫提供了证据,这种阻挫有利于RuCl$_3$中自旋液体态的形成。

英文摘要:

In RuCl$_3$, inelastic neutron scattering and Raman spectroscopy reveal a continuum of non-spin-wave excitations that persists to high temperature, suggesting the presence of a spin liquid state on a honeycomb lattice. In the context of the Kitaev model, magnetic fields introduce finite interactions between the elementary excitations, and thus the effects of high magnetic fields - comparable to the spin exchange energy scale - must be explored. Here we report measurements of the magnetotropic coefficient - the second derivative of the free energy with respect to magnetic field orientation - over a wide range of magnetic fields and temperatures. We find that magnetic field and temperature compete to determine the magnetic response in a way that is independent of the large intrinsic exchange interaction energy. This emergent scale-invariant magnetic anisotropy provides evidence for a high degree of exchange frustration that favors the formation of a spin liquid state in RuCl$_3$.

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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