YBa_(2-x)Pr_xCu_3O_(7-δ)体系的超导电性及热电势率研究  

SUPERCONDUCTIVITY AND THERMOPOWER OF YBa 2- x Pr x Cu 3O 7- δ

作　　者：任宇航[1] 许祝安[1] 余卫华 张宣嘉[1] 焦正宽[1] 张其瑞[1] 

机构地区：[1]浙江大学物理系

出　　处：《低温物理学报》1997年第5期372-376,共5页Low Temperature Physical Letters

基　　金：家超导攻关资助

摘　　要：作者在此报道对Ｂａ位Ｐｒ替代的ＹＢａ２－ｘＰｒｘＣｕ３Ｏ７－δ的单相体系的ＸＲＤ、电阻率和热电势率测量．对热电势率结果深入分析后得到体系随ｘ的增加系统的下降，与Ｈａｌ效应测量结果相一致．因此，作者认为ＹＢａ２－ｘＰｒｘＣｕ３Ｏ７－δ体系中Ｔｃ下降的主要原因是Ｐｒ替代引起的有效载流子浓度的减小．We report here on the preparation, X ray diffraction, electrical resistivity ρ(T) and thermopower ( S ) of YBa 2- x Pr x Cu 3O 7- δ (0≤ x ≤0.2). The thermopower data show all samples were underdoped compared to YBa 2Cu 3O 7- δ and the hole density decreased as x (Pr) increased. These results are consistent with the hall effect. The T c suppression appears to be caused by a drop in the concentration of mobile holes in the CuO 2 planes.

关 键 词：YBPCO 超导电性 超导体 热电势率 

分 类 号：TM262.014[一般工业技术—材料科学与工程] O511.2[电气工程—电工理论与新技术]