氧含量对Pr1.85Ce0.15CuO4-x和Pr2CuO4-x结构、磁性和超导电性的影响  

Effects of Oxygen Content on Structure,Magnetic Properties and Superconductivity of Pr_(1.85)Ce_(0.15)CuO_(4-x) and Pr_2CuO_(4-x) System

作　　者：王法社[1] 赵勇[1,2] 

机构地区：[1]西南交通大学,磁浮技术与磁浮列车教育部重点实验室,四川成都610031 [2]University of New South Wales,Sydney 2052 NSW,Australia

出　　处：《稀有金属材料与工程》2010年第10期1790-1794,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50588201);国家“973”基础研究(2007CB616906)

摘　　要：通过固相反应法制备了电子型Pr1.85Ce0.15CuO4-x和其母体Pr2CuO4-x。X射线衍射表明:制备的样品具有单相结构,杂相比较少。磁测量的结果表明:在Pr1.85Ce0.15CuO4-x中,0.05≤x≤0.20(质量分数,%,下同)时具有超导电性,起始转变温度Tc=24.5K。而Pr2CuO4-x仅仅通过调节氧含量不能实现超导。并且通过氧含量对Pr1.85Ce0.15CuO4-x和Pr2CuO4-x结构、磁性的不同影响的对比研究发现,在Pr1.85Ce0.15CuO4-x中通过调节氧含量实现超导的原因是引入自由载流子。Pr2CuO4-x不能实现超导的原因是氧空位出现在不同的氧位上,并对相关机制进行了探讨。The samples of Pr1.85Ce0.15CuO4-x and Pr2CuO4-x were prepared by a solid reaction method. X-ray diffraction patterns reveal that single-phase Pr1.85Ce0.15CuO4-x and Pr2CuO4-x have been obtained with a small amount of impurity phases. For the samples of Pr1.85Ce0.15CuO4-x,superconductivity transitions are observed in the range of 0.05≤x≤0.20,and Tconset is 24.5 K. The samples of Pr2CuO4-x can not achieve superconductivity only by adjusting the oxygen content. By the comparison of different effects of the oxygen content on structure and magnetic properties,it is found that in Pr1.85Ce0.15CuO4-x samples the reason of superconductivity realization by adjusting oxygen content is free carrier introduction,while for Pr2CuO4-x the reason why the superconductivity does not realize is that oxygen vacancies do not appear in the same oxygen position. The relative mechanism was discussed.

关 键 词：氧含量 单相结构 磁性 超导电性 Structure 自由载流子 转变温度 质量分数 法制备 相关机制 固相反应 对比研究 调节 氧空位 电子型 磁测量 样品 氧位 射线 射表 

分 类 号：O511[理学—低温物理]