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
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 K and 145 K in layered compound EuCuAs and SrCuAs, respectively. from both the transport and heat capacity. The thermal expansion measurements show that the variation of the lattice parameters () around is much less than that for a typical crystalline phase transition. Our experimental results reveal that the transition in EuCuAs and SrCuAs should be driven by subtle structural-distortion.
(Thermal properties of amorphous solids and glasses: heat capacity, thermal expansion, etc.)
Fund: 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.
Yong Nie(聂勇), Zheng Chen(陈正), Ming Mei(梅明), Yuan-Yuan Wang(王园园), Jia-Ting Wu(吴嘉挺), Jia-Liang Jiang(蒋佳良), Wen-Hai Song(宋文海), Wei Ning(宁伟), Zhao-Sheng Wang(王钊胜), Xiang-De Zhu(朱相德), and Ming-Liang Tian(田明亮) Subtle lattice distortion-driven phase transitions in layered ACu4As2 (A = Eu, Sr) 2023 Chin. Phys. B 32 106102
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