Structure, Magnetotransport, and Theoretical Study on the Layered Antiferromagnet Topological Phase EuCd2As2 under High Pressure

Author:

Yu Zhenhai123ORCID,Chen Xuejiao4,Xia Wei15,Wang Ningning6,Lv Xiaodong4,Wu Desheng6,Wu Wei6,Liu Ziyi6,Zhao Jinggeng7,Li Mingtao2,Li Shujia2,Li Xin2,Dong Zhaohui8,Zhou Chunyin8,Zhang Lili8,Wang Xia9,Yu Na9,Zou Zhiqiang9,Luo Jianlin6,Cheng Jinguang6,Wang Lin23,Zhong Zhicheng4,Guo Yanfeng15ORCID

Affiliation:

1. School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China

2. Center for High Pressure Science and Technology Advanced Research Shanghai 201203 China

3. Center for High Pressure Science (CHiPS) State Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao 066004 China

4. CAS Key Laboratory of Magnetic Materials and Devices & Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 China

5. ShanghaiTech Laboratory for Topological Physics ShanghaiTech University Shanghai 201210 China

6. Beijing National Lab for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China

7. School of Physics Harbin Institute of Technology Harbin 150080 China

8. Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201204 China

9. Analytical Instrumentation Center School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China

Abstract

AbstractRich 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 magnetization, magneto‐transport, and structure measurements under high pressure and first principles calculations, this study finds that the pressure can drive the in‐plane antiferromagnetic structure of EuCd2As2 across an intermediate in‐plane FM structure then into the out‐of‐plane FM structure. This study also finds butterfly‐shaped MR and anomalous Hall effect under large pressure, which may support the pressure‐driven FM state. High‐pressure angle‐dispersive X‐ray diffraction and X‐ray absorption near‐edge spectroscopy measurements exclude structure transition and/or change of Eu2+ valence state as sources for the magnetic phase transitions. Alternatively, apparently reduced axial ratio (c/a) and compressed Eu‐layer space distance should play important roles. Interestingly, the calculations unveil that the out‐of‐plane FM structure hosts only one pair of Weyl nodes around the Fermi level, suggesting that pressure can be an alternative way to realize the ideal Weyl semimetal state in EuCd2As2 and will be useful for exploring exotic topological properties in such layered magnetic topological phase with strongly competing magnetic exchanges.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Beijing Municipality

Publisher

Wiley

Subject

Electrical and Electronic Engineering,Computational Theory and Mathematics,Condensed Matter Physics,Mathematical Physics,Nuclear and High Energy Physics,Electronic, Optical and Magnetic Materials,Statistical and Nonlinear Physics

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