【摘 要】
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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
【机 构】
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Key Laboratory for Microstructural Material Physics of Hebei Province,School of Science,Yanshan Univ
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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.
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