Field evolution of the spin-liquid candidate YbMgGaO4
Field evolution of the spin-liquid candidate YbMgGaO4
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自旋液体候选 YbMgGaO4 的场演化
DOI：
10.1103/physrevb.102.104433
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发表时间：
2020-09-28
影响因子：
3.7
通讯作者：
Tsirlin, Alexander A.
中科院分区：
文献类型：
--
作者：
Bachus, Sebastian;Iakovlev, Ilia A.;Tsirlin, Alexander A.
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1/3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，对于平行于c的H，μ H-0 = 1.0-2.5 T，对于垂直于c的H，μ H-0 = 2-5 T。使用Monte Carlo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1/2高原，涂抹出的随机分布的交换耦合在YbMgGaO 4。
We report magnetization, heat capacity, thermal expansion, and magnetostriction measurements down to millikelvin temperatures on the triangular antiferromagnet YbMgGaO4. Our data exclude the formation of the distinct 1/3 plateau phase observed in other triangular antiferromagnets, but reveal plateaulike features in second derivatives of the free energy, magnetic susceptibility, and specific heat, at mu H-0 = 1.0-2.5 T for H parallel to c and 2-5 T for H perpendicular to c. Using Monte Carlo simulations of a realistic spin Hamiltonian, we ascribe these features to nonmonotonic changes in the magnetization and the 1/2 plateau that is smeared out by the random distribution of exchange couplings in YbMgGaO4.