中国物理B ›› 2023, Vol. 32 ›› Issue (10): 106102-106102.doi: 10.1088/1674-1056/acd36b

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Subtle lattice distortion-driven phase transitions in layered ACu4As2 (A = Eu, Sr)

Yong Nie(聂勇)1,2, Zheng Chen(陈正)1, Ming Mei(梅明)1,2, Yuan-Yuan Wang(王园园)1,2, Jia-Ting Wu(吴嘉挺)1,2, Jia-Liang Jiang(蒋佳良)1,2, Wen-Hai Song(宋文海)3, Wei Ning(宁伟)1,†, Zhao-Sheng Wang(王钊胜)1, Xiang-De Zhu(朱相德)1,‡, and Ming-Liang Tian(田明亮)1,4,§   

  1. 1 Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Hefei Institutes of Physical Science(HFIPS), Chinese Academy of Sciences, Hefei 230031, China;
    2 Department of Physics, University of Science and Technology of China, Hefei 230026, China;
    3 Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China;
    4 School of Physics, Anhui University, Hefei 230601, China
  • 收稿日期:2023-04-05 修回日期:2023-04-05 接受日期:2023-05-09 出版日期:2023-09-21 发布日期:2023-09-21
  • 通讯作者: Wei Ning, Xiang-De Zhu, Ming-Liang Tian E-mail:ningwei@hmfl.ac.cn;xdzhu@hmfl.ac.cn;mltian@hmfl.ac.cn
  • 基金资助:
    Project supported by the National Key Research and Development Program of China (Grant No. 2021YFA1600201), the National Natural Science Foundation of China (Grant Nos. U19A2093, U2032214, U2032163, U1732274, 11904002, and 11874359), the Collaborative Innovation Program of Hefei Science Center, Chinese Academy of Sciences (CAS) (Grant No. 2019HSC-CIP 001), the Youth Innovation Promotion Association of CAS (Grant No. 2021117), the Natural Science Foundation of Anhui Province, China (Grant No. 1908085QA15), the Director Fund from the Hefei Institutes of Physical Science (HFIPS) (Grant No. YZJJQY202304), the Director Fund from the the Chinese Academy of Sciences and Hefei Institutes of Physical Science (CASHIPS), China (Grant No. E26MMG71131), and the High Magnetic Field Laboratory of Anhui Province, China.

Subtle lattice distortion-driven phase transitions in layered ACu4As2 (A = Eu, Sr)

Yong Nie(聂勇)1,2, Zheng Chen(陈正)1, Ming Mei(梅明)1,2, Yuan-Yuan Wang(王园园)1,2, Jia-Ting Wu(吴嘉挺)1,2, Jia-Liang Jiang(蒋佳良)1,2, Wen-Hai Song(宋文海)3, Wei Ning(宁伟)1,†, Zhao-Sheng Wang(王钊胜)1, Xiang-De Zhu(朱相德)1,‡, and Ming-Liang Tian(田明亮)1,4,§   

  1. 1 Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Hefei Institutes of Physical Science(HFIPS), Chinese Academy of Sciences, Hefei 230031, China;
    2 Department of Physics, University of Science and Technology of China, Hefei 230026, China;
    3 Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China;
    4 School of Physics, Anhui University, Hefei 230601, China
  • Received:2023-04-05 Revised:2023-04-05 Accepted:2023-05-09 Online:2023-09-21 Published:2023-09-21
  • Contact: Wei Ning, Xiang-De Zhu, Ming-Liang Tian E-mail:ningwei@hmfl.ac.cn;xdzhu@hmfl.ac.cn;mltian@hmfl.ac.cn
  • Supported by:
    Project supported by the National Key Research and Development Program of China (Grant No. 2021YFA1600201), the National Natural Science Foundation of China (Grant Nos. U19A2093, U2032214, U2032163, U1732274, 11904002, and 11874359), the Collaborative Innovation Program of Hefei Science Center, Chinese Academy of Sciences (CAS) (Grant No. 2019HSC-CIP 001), the Youth Innovation Promotion Association of CAS (Grant No. 2021117), the Natural Science Foundation of Anhui Province, China (Grant No. 1908085QA15), the Director Fund from the Hefei Institutes of Physical Science (HFIPS) (Grant No. YZJJQY202304), the Director Fund from the the Chinese Academy of Sciences and Hefei Institutes of Physical Science (CASHIPS), China (Grant No. E26MMG71131), and the High Magnetic Field Laboratory of Anhui Province, China.

摘要: The compounds composed of transition metal cations and pnictide anions provide a rich platform for studying novel physical phenomena. Here we report on the observation of a phase transition at $\sim 70$ K and 145 K in layered compound EuCu$_{4}$As$_{2}$ and SrCu$_{4}$As$_{2}$, respectively. from both the transport and heat capacity. The thermal expansion measurements show that the variation of the lattice parameters ($\Delta L_{b}/L_{ab}$) around $T_{\rm P}$ is much less than that for a typical crystalline phase transition. Our experimental results reveal that the transition in EuCu$_{4}$As$_{2}$ and SrCu$_{4}$As$_{2}$ should be driven by subtle structural-distortion.

关键词: thermal expansion, specific heat, lattice-distortion

Abstract: The compounds composed of transition metal cations and pnictide anions provide a rich platform for studying novel physical phenomena. Here we report on the observation of a phase transition at $\sim 70$ K and 145 K in layered compound EuCu$_{4}$As$_{2}$ and SrCu$_{4}$As$_{2}$, respectively. from both the transport and heat capacity. The thermal expansion measurements show that the variation of the lattice parameters ($\Delta L_{b}/L_{ab}$) around $T_{\rm P}$ is much less than that for a typical crystalline phase transition. Our experimental results reveal that the transition in EuCu$_{4}$As$_{2}$ and SrCu$_{4}$As$_{2}$ should be driven by subtle structural-distortion.

Key words: thermal expansion, specific heat, lattice-distortion

中图分类号:  (Structure of specific crystalline solids)

  • 61.66.-f
65.40.Ba (Heat capacity) 65.60.+a (Thermal properties of amorphous solids and glasses: heat capacity, thermal expansion, etc.)