湿化学法测TI系超导体中组份及空穴浓度  

Measurement of Composition and Hole Concentration in Tl-based Superconductor by Chemical Method

作　　者：彭志强[1] 孟宪仁 涂清云[1] 林明柱[1] 林振金 桑丽华[1] 沈德元[1] 刘振兴[2] 

机构地区：[1]北京师范大学物理系 [2]中国科学院北京物理所

出　　处：《低温与超导》1993年第3期11-15,共5页Cryogenics and Superconductivity

基　　金：国家自然科学基金

摘　　要：该文用湿化学方法和质量分析精确测定了Tl-Ba-Ca-Cu-O样品中Tl和O的含量及其结构式,计算了样品中Cu的平均价态及铜氧层中有效空穴浓度.分析表明,样品的零电阻转变温度随空穴浓度的变化,存在一最佳的样品空穴浓度,对应的转变温度Tc最大.A wet chemical method has been applied to several T1-based superconductors to determine the Thallium and Oxygen contents.The mean copper valence and hole Concentration (P) per pyramidal Cu-O sheet can be calculated from these results.Investigaton of the relation between TCR=0 and P shows that there is a dome-shaped behavior with a maximum Tc at a optimal P.

关 键 词：超导体 空穴 浓度 湿法 钛 测量 

分 类 号：TM263.06[一般工业技术—材料科学与工程]