中国物理B ›› 2021, Vol. 30 ›› Issue (7): 76106-076106.doi: 10.1088/1674-1056/abf349

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Structural modulation and physical properties of cobalt-doped layered La2M5As3O2 (M= Cu, Ni) compounds

Lei Yang(杨蕾)1,2, Yan-Peng Song(宋艳鹏)2,3, Jun-Jie Wang(王俊杰)2,3, Xu Chen(陈旭)2,3, Hui-Jing Du(杜会静)1,†, and Jian-Gang Guo(郭建刚)2,4,‡   

  1. 1 Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, China;
    2 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    3 University of Chinese Academy of Sciences, Beijing 100049, China;
    4 Songshan Lake Materials Laboratory, Dongguan 523808, China
  • 收稿日期:2021-02-26 修回日期:2021-03-27 接受日期:2021-03-30 出版日期:2021-06-22 发布日期:2021-06-24
  • 通讯作者: Hui-Jing Du, Jian-Gang Guo E-mail:hjdu@ysu.edu.cn;jgguo@iphy.ac.cn
  • 基金资助:
    Projected supported by the National Natural Science Foundation of China (Grant Nos. 51922105 and 51772322), the National Key Research and Development Program of China (Grant Nos. 2017YFA0304700 and 2016YFA0300600), and the Beijing Natural Science Foundation, China (Grant No. Z200005).

Structural modulation and physical properties of cobalt-doped layered La2M5As3O2 (M= Cu, Ni) compounds

Lei Yang(杨蕾)1,2, Yan-Peng Song(宋艳鹏)2,3, Jun-Jie Wang(王俊杰)2,3, Xu Chen(陈旭)2,3, Hui-Jing Du(杜会静)1,†, and Jian-Gang Guo(郭建刚)2,4,‡   

  1. 1 Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, China;
    2 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    3 University of Chinese Academy of Sciences, Beijing 100049, China;
    4 Songshan Lake Materials Laboratory, Dongguan 523808, China
  • Received:2021-02-26 Revised:2021-03-27 Accepted:2021-03-30 Online:2021-06-22 Published:2021-06-24
  • Contact: Hui-Jing Du, Jian-Gang Guo E-mail:hjdu@ysu.edu.cn;jgguo@iphy.ac.cn
  • Supported by:
    Projected supported by the National Natural Science Foundation of China (Grant Nos. 51922105 and 51772322), the National Key Research and Development Program of China (Grant Nos. 2017YFA0304700 and 2016YFA0300600), and the Beijing Natural Science Foundation, China (Grant No. Z200005).

摘要: We investigate the structural variation and physical properties of layered La2M5As3O2 (M=Cu, Ni) compound upon Co doping. It is found that the substitution of Co ion just induces the monotonous change of lattice constants without observing the anomalous kink in superconducting La2(Cu1-xNix)5As3O2 solid-solutions. Meanwhile, this doping barely changes As-As bond length in [M5As3]2- subunit (±2%), being significantly smaller than 7% shrinkage of that in La2(Cu1-xNix)5As3O2. Therefore, the doping dependence of crystal structure exhibits similar trend with Ba1-xKxFe2As2 without the interference of As1-As2 bonding, implying that the Co substitution for Cu/Ni is hole-doped. In terms of physical property, La2(Cu1-xCox)5As3O2 turns into itinerant ferromagnetic metal, while La2(Ni1-xCox)5As3O2 shows paramagnetism and suppressed structural phase transition upon Co-doping. The distinct structural variation and absence of superconductivity provide important clues to understand the effect of As-As bond in [M5As3]2- subunit.

关键词: crystal structure, As-As covalent bond, transport property

Abstract: We investigate the structural variation and physical properties of layered La2M5As3O2 (M=Cu, Ni) compound upon Co doping. It is found that the substitution of Co ion just induces the monotonous change of lattice constants without observing the anomalous kink in superconducting La2(Cu1-xNix)5As3O2 solid-solutions. Meanwhile, this doping barely changes As-As bond length in [M5As3]2- subunit (±2%), being significantly smaller than 7% shrinkage of that in La2(Cu1-xNix)5As3O2. Therefore, the doping dependence of crystal structure exhibits similar trend with Ba1-xKxFe2As2 without the interference of As1-As2 bonding, implying that the Co substitution for Cu/Ni is hole-doped. In terms of physical property, La2(Cu1-xCox)5As3O2 turns into itinerant ferromagnetic metal, while La2(Ni1-xCox)5As3O2 shows paramagnetism and suppressed structural phase transition upon Co-doping. The distinct structural variation and absence of superconductivity provide important clues to understand the effect of As-As bond in [M5As3]2- subunit.

Key words: crystal structure, As-As covalent bond, transport property

中图分类号:  (Structure of bulk crystals)

  • 61.50.-f
72.15.-v (Electronic conduction in metals and alloys) 75.20.En (Metals and alloys) 74.70.Dd (Ternary, quaternary, and multinary compounds)