【摘要】 本文研究了Pr_0.2Yb_0.8-xLa_xBa₂Cu₃O_7-δ体系的晶体结构,超导电性和磁性。结果表明,在Pr含量不变的条件下,超导转变温度随稀土离子半径增大而降低,当x≈0.65时,Tc=0;电子比热和费密能级上的态密度也随稀土离子半径增大而降低。并讨论了稀土离子半径与杂化的关系。更多还原

【Abstract】 The crystal structure, superconducting and magnetic properties of Pr0.2Yb0.8-xLaxBa2Cu3 O7-δ have been investigated. The res ults show that with the concentration of Pr being constant, the critical transition temperature Tc of this syster decreases with the increasing of La concetration and Tc is quenched at x = 0.6. The coefficient of electron specific heat and the density of states N(0) inferred from magnetic measurements also decrease with x. The relation between the effective radii of rare earth elements and hybridization is discussed in brief.更多还原