Evolution of magnetism, valence, and crystal lattice in EuCd2As2 under pressure
Evolution of magnetism, valence, and crystal lattice in EuCd2As2 under pressure
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DOI：
10.1103/physrevb.107.245121
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发表时间：
2023-06
影响因子：
3.7
通讯作者：
Greeshma C. Jose;Kaleb C. Burrage;Jose L. Gonzalez Jimenez;W. Xie;B. Lavina;Jiyong Zhao;E. Alp;Dongzhou Zhang;Yuming Xiao;Y. Vohra;Wenli Bi
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文献类型：
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作者：
Greeshma C. Jose;Kaleb C. Burrage;Jose L. Gonzalez Jimenez;W. Xie;B. Lavina;Jiyong Zhao;E. Alp;Dongzhou Zhang;Yuming Xiao;Y. Vohra;Wenli Bi
已被提出作为一个内在的拓扑磁系统的理想平台之一，潜在地托管一对外尔点时，它被调谐到铁磁状态与自旋对齐的平面外的外部压力或化学掺杂。为了研究理想拓扑状态的可能实现，我们使用基于同步加速器的时域穆斯堡尔谱、X射线吸收谱和粉末X射线衍射系统地研究了磁态、价态和晶体结构的压力控制。我们的实验结果表明，在压力高达42.8 GPa的情况下，磁位形主要保持在平面内，压力有效地提高了磁有序温度。同时，Eu离子在经受高达35.9GPa的压力时保持二价，并且三角晶格保持高达34.6GPa。我们的工作提供了有价值的实验数据基准未来的理论研究在磁性拓扑材料。
has been proposed to be one of the ideal platforms as an intrinsic topological magnetic system, potentially hosting a single pair of Weyl points when it is tuned into the ferromagnetic state with spins aligned out of plane by either external pressure or chemical doping. To investigate the possible realization of an ideal topological state, we have systematically investigated pressure control of the magnetic state, valence, and crystal structure using synchrotron-based time-domain Mössbauer spectroscopy, x-ray absorption spectroscopy, and powder x-ray diffraction. Our experimental results show that the magnetic configuration remains mostly in plane under pressure up to 42.8 GPa and pressure effectively enhances the magnetic ordering temperature. Meanwhile, Eu ions remain divalent when subjected to pressure up to 35.9 GPa, and the trigonal crystal lattice is maintained up to 34.6 GPa. Our work provides valuable experimental data to benchmark future theoretical studies in magnetic topological materials.