缺Sr和真空退火对Bi_(1.8)Pb_(0.2)Sr_2CuO_6相的超导电性和正常态输运性质的影响  

THE INFLUENCE OF Sr VACANCY AND ANNEALING CONDITIONS ON THE SUPERCONDUCTIVITY AND NORMAL-STATE TRANSPORT PROPERTIES OF Bi_(1.8)Pb_(0.2)Sr_2CuO_6 PHASE

作　　者：闫宏杰[1] 其木苏荣[1] 于肇贤[1] 腾功清[1] 

机构地区：[1]北京信息科技大学理学院物理系,北京100192

出　　处：《低温物理学报》2008年第4期322-325,共4页Low Temperature Physical Letters

基　　金：北京市教委科研基金(KM200811232010)资助的课题~~

摘　　要：本文采用传统固相反应法,成功制备了掺Pb和缺Sr的两套Bi2201系列样品,并对样品作了真空退火处理,利用电阻率分别对其超导电性和输运性质进行了观察和比较研究.我们的研究分析表明,两组样品的物理性能的变化有其不同的内在机制:真空退火样品的性能变化可以从载流子浓度的变化方面得到解释,而对于Sr位空缺样品的性能变化,则从Bi2201相的微结构畸变特征得到理解.Pb-doped and Sr-vacant Bi2201 polycrystalline samples were successfully synthesized by conventional solid-state reaction method, and then annealed in vacuum. The superconductivity and the transport properties were systematically investigated and compared by means of resistivity measurement. Our analysis show that the variations of physical properties result from different mechanism for two groups of sampies. That is, the physical properties of annealing samples in vacuum result from the variation of carrier concentration. Nevertheless, for the Sr-vacant samples the experimental results can be explained by microstructure distortion.

关 键 词：Bi2201 超导电性 输运性质 

分 类 号：O511.2[理学—低温物理] TG115[理学—物理]