arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.09775cond-mat.str-el
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自旋液体候选物YbMgGaO $_4$的场演化

Field evolution of the spin-liquid candidate YbMgGaO$_4$

Sebastian Bachus, Ilia A. Iakovlev, Yuesheng Li, Andreas Wörl, Yoshifumi Tokiwa, Langsheng Ling, Qingming Zhang, Vladimir V. Mazurenko, Philipp Gegenwart, Alexander A. Tsirlin

摘要:

我们报告的磁化强度,热容,热膨胀,和磁致伸缩测量到毫开尔文温度的三角形反铁磁体YbMgGaO $_4$。我们的数据排除了在其他三角形反铁磁体中观察到的明显的$\frac13$平台相的形成,但在自由能、磁化率和比热的二阶导数中揭示了平台状特征,对于$H\parallel{}c$,$μ_0H$ = 1.0 - 2.5 T,对于$H\perp{}c$,$μ_0H$ = 2 - 5 T。使用蒙特卡罗模拟的一个现实的自旋哈密顿量,我们归因于这些功能的非单调变化的磁化强度和$\frac12$高原,涂抹了由随机分布的交换耦合在Yb MgGaO $_4$。

英文摘要:

We report magnetization, heat capacity, thermal expansion, and magnetostriction measurements down to millikelvin temperatures on the triangular antiferromagnet YbMgGaO$_4$. Our data exclude the formation of the distinct $\frac13$ plateau phase observed in other triangular antiferromagnets, but reveal plateaulike features in second derivatives of the free energy, magnetic susceptibility and specific heat, at $μ_0H$ = 1.0 - 2.5 T for $H\parallel{}c$ and 2 - 5 T for $H\perp{}c$. Using Monte-Carlo simulations of a realistic spin Hamiltonian, we ascribe these features to nonmonotonic changes in the magnetization and the $\frac12$ plateau that is smeared out by the random distribution of exchange couplings in YbMgGaO$_4$.

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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