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arXiv 2202.06016cond-mat.mtrl-sci
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层状反铁磁体 EuCd2As2 中压力诱导的理想外尔半金属态

Pressure-induced ideal Weyl semimetal state in the layered antiferromagnet EuCd2As2

Zhenhai Yu1, Xuejiao Chen, Wei Xia, Ningning Wang, Xiaodong Lv, Xiaolei Liu, Hao Su, Zhongyang Li, Desheng Wu, Wei Wu, Ziyi Liu, Jinggeng Zhao, Mingtao Li, Shuj… 展开作者

Zhenhai Yu1, Xuejiao Chen, Wei Xia, Ningning Wang, Xiaodong Lv, Xiaolei Liu, Hao Su, Zhongyang Li, Desheng Wu, Wei Wu, Ziyi Liu, Jinggeng Zhao, Mingtao Li, Shujia Li, Xin Li, Zhaohui Dong, Chunyin Zhou, Lili Zhang, Xia Wang, Na Yu, Zhiqiang Zou, Jianlin Luo, Jinguang Cheng, Lin Wang, Zhicheng Zhong, Yanfeng Guo

AI总结:

通过高压磁输运、结构表征与第一性原理计算,发现压力可驱动 EuCd2As2 由面内反铁磁态经面内铁磁态进入面外铁磁态,从而在无外磁场条件下实现理想外尔半金属态,并揭示轴比减小与 Eu 层间距压缩是关键因素。

摘要:

层状反铁磁体 EuCd2As2 中磁性与拓扑相互作用所蕴含的丰富非平庸拓扑相引起了广泛关注,尤其是在中等外加磁场驱动的自旋极化铁磁(FM)结构中实现的理想外尔半金属态。本工作结合高压磁输运测量、结构表征和第一性原理计算,发现施加压力同样可以在 EuCd2As2 中实现理想外尔态,其路径是驱动面内反铁磁态经过一个中间的面内 FM 态,然后进入面外 FM 态。我们的高压角色散 X 射线衍射和 X 射线吸收近边谱测量排除了结构相变和/或 Eu2+ 价态变化作为磁相变来源的可能性。相反,明显减小的轴比(c/a)和压缩的 Eu 层间距可能起重要作用。我们的结果为在 EuCd2As2 中实现理想外尔半金属态提供了一条替代途径,并将有助于利用高压在具有强竞争磁交换作用的层状磁拓扑相中探索奇异拓扑性质。

英文摘要:

The rich nontrivial topological phases rooted in the interplay between magnetism and topology in the layered antiferromagnet EuCd2As2 have captured vast attention, especially the ideal Weyl semimetal state realized in the spin-polarized ferromagnetic (FM) structure driven by a moderate external magnetic field. In this work, combining high-pressure magnetotransport measurements, structure chracterizations and first principles calculations, we find that application of pressure can also realize the ideal Weyl state in EuCd2As2 through driving the in-plane antiferromagnetic state across an intermediate in-plane FM state then into the out-of-plane FM state. Our high-pressure angle dispersive X-ray diffraction and X-ray absorption near-edge spectroscopy measurements excluded structure transition and/or change of Eu2+ valence state as the sources for the magnetic phase transitions. Alternatively, the apparently reduced axial ratio (c/a) and compressed Eu-layer space distance should play important roles. Our result provides an alternative way to realize the ideal Weyl semimetal state in EuCd2As2 and would be instructive for the exploration of exotic topological properties in such layered magnetic topological phase with strongly competing magnetic exchanges by using high pressure.

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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