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~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(△L_(b)/L_(ab))around T_(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.
作者
聂勇
陈正
梅明
王园园
吴嘉挺
蒋佳良
宋文海
宁伟
王钊胜
朱相德
田明亮
Yong Nie;Zheng Ch en;Ming Mei;Yuan-Yuan Wang;Jia-Ting Wu;Jia-Liang Jiang;Wen-Hai Song;Wei Ning;Zhao-Sheng Wang;Xiang-De Zhu;Ming-Liang Tian(Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions,High Magnetic Field Laboratory,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China;Department of Physics,University of Science and Technology of China,Hefei 230026,China;Key Laboratory of Materials Physics,Institute of Solid State Physics,HFIPS,Chinese Academy of Sciences,Hefei 230031,China;School of Physics,Anhui University,Hefei 230601,China)
基金
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)
the High Magnetic Field Laboratory of Anhui Province,China。
