La1-x／2Pr1-x／2SrxCuO4的电输运性质和超导电性  

RESISTANCE ACTION AND SUPERCONDUCTIVITY OF La_(1-x)/2Pr_(1-x)/2Sr_xCuO_4

作　　者：王法社[1] 杨烨[1] 陈永亮[1] 崔雅静[1] 张勇[1] 赵勇[1] 

机构地区：[1]磁浮技术与磁浮列车教育部重点实验室,西南交通大学超导研究开发中心,成都610031

出　　处：《低温物理学报》2008年第2期116-119,共4页Low Temperature Physical Letters

基　　金：自然科学基金(项目编号;50588210);国家973基础研究基金(项目编号:2007CB616906)资助的课题~~

摘　　要：La1-x/2Pr1-x/2SrxCuOy(LPSCO)多晶样品采用传统的固相反应法制备.X射线衍射表明:LPSCO具有典型的空穴搀杂的T-214相的结构.磁化率测量显示:Sr搀杂在0.05≤x≤0.30范围内具有超导转变;Tc随x的增大呈抛物线形式变化,且在x=0.18时达到最大值28K.电阻的测量显示:随搀杂量的增大,系统呈现从绝缘到半导体,最后到金属的导电行为的变化;在欠掺杂区,正常态电阻温度关系符合ρ(T)=ρ0+αT-ClnT;而在过掺杂区,对数项消失.本文从替代所引起的晶体结构和载流子特性变化解释了Sr掺杂样品的电输运行为和超导特性.La1-x/2Pr1-x/2SrxCuOy （LPSCO） samples were prepared by the conventional solid-state reaction; X-ray diffraction revealed that LPSCO have a typical hole-doped T-214 structure. Superconductivity transitions are observed in a wide Sr concentration range of 0.05≤x≤0. 30. Tc- x relation shows a bell shape with a maximum at x=0. 18. Electrical resistivity of the samples was measured by a conventional DC four-probe method, which shows a ρ（T） =ρ0 ＋αT-ClnT type dependence in underdoped regime. The lnT term vanishes in the overdoped region, indicating that it is related to the two-dimensional electron scattering in the system.

关 键 词：空穴掺杂 电阻率 超导电性 

分 类 号：O511.4[理学—低温物理]