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

• 作者: Lei Yang Yan-Peng Song Jun-Jie Wang Xu Chen Hui-Jing Du Jian-Gang Guo
• 来源期刊: 中国物理B（英文版）
• 年，卷（期）: 2021,（7）
• 所属期刊栏目: CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROP-ERTIES
• 页码范围: 447-454
• 页数: 8页
• 语种: 英文
• DOI: 10.1088/1674-1056/abf349

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 with-out 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.