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arXiv 2306.02463cond-mat.str-elcond-mat.mtrl-sci
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三角晶格化合物 Ba3Er(BO3)3 中双子晶格交换物理的实现

Realization of two-sublattice exchange physics in the triangular lattice compound Ba3Er(BO3)3

Matthew Ennis, Rabindranath Bag, Chunxiao Liu, Sachith E. Dissanayake, Alexander I. Kolesnikov, Leon Balents, Sara Haravifard

AI总结:

本文合成并研究 Ba3Er(BO3)3 单晶,结合热容、晶体场计算、对称性分析与经典模拟,证明其实现由蜂窝格点与六边形中心自旋共同构成的双子晶格交换物理。

摘要:

我们合成了铒基三角晶格化合物 Ba3Er(BO3)3 的高质量单晶样品。热学和磁性测量揭示出显著的各向异性,并显示在 100 mK 处可能存在相变。低温磁热容可从磁性离子 Er3+ 所占据的两个 Wyckoff 位置来理解,这两个位置具有不同的对称性质和晶体场环境。针对晶体电场能级的点电荷计算与这一理解相符。基于对称性分析和经典模拟,我们认为 Ba3Er(BO3)3 实现了一种有趣的双子晶格交换物理:由于六边形中心处的额外自旋,蜂窝晶格自旋形成铁磁关联,但最终呈反铁磁有序。此外,我们的结果表明,为充分解释实验观测,需要考虑量子涨落。

英文摘要:

We have synthesized high-quality single crystal samples of the erbium-based triangular lattice compound Ba3Er(BO3)3. Thermal and magnetic measurements reveal large anisotropy and a possible phase transition at 100 mK. The low-temperature magnetic heat capacity can be understood from the two Wyckoff positions that the magnetic ions Er3+ occupy, which have distinct symmetry properties and crystal field environments. A point charge calculation for the crystal electric field levels is consistent with this understanding. Based on symmetry analysis and classical simulation, we argue that Ba3Er(BO3)3 realizes an interesting two-sublattice exchange physics, in which the honeycomb lattice spins develop ferromagnetic correlations due to the additional spins at the hexagon centers but eventually order antiferromagnetically. Additionally, our results suggest that quantum fluctuations need to be considered in order to fully explain the experimental observations.

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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