Bi2201体系中Raman散射、微结构和输运性质研究(英文)  

RAMAN SCATTERING, MICROSTRUCTURE AND TRANSPORT PROPERTY OF Fe DOPED Bi2201 SYSTEM

作　　者：许高杰[1,2] 毛志强[1] 张建武[1] 许存义[1] 左建 闫宏杰[1] 张裕恒 

机构地区：[1]中国科技大学结构中心 [2]中国科技大学天文与应用物理系,合肥230026

出　　处：《低温物理学报》2000年第1期56-60,共5页Low Temperature Physical Letters

摘　　要：利用X光衍射,电子衍射,Raman散射和电阻率等手段对多晶样品Bi1.8Pb0.2Sr2Cu1-xFexOy,Bi1.8Pb0.2Sr1.6+xLa0.4-xCu1-xFexOy的结构和性能进行了研究.结果表明:Bi2201体系的调制特征与额外氧的多少无关,625cm-1附近的Raman峰受‘电荷转移’效应和调制结构变化的显著影响,晶体的微结构变化强烈影响体系的超导电性和输运性质.Polycrystalline samples of Bi\-\{1.8\}Pb\-\{0.2\}Sr\-2Cu\-\{1- x \}Fe\- x O\- y , Bi\-\{1.8\}Pb\-\{0.2\}Sr\-\{1.6+ x \}La\-\{0.4- x \}Cu\-\{1- x \}Fe\- x O\- y have been studied by means of X ray diffraction, ED patterns, Raman scattering and resistivity. Experimental results show that the characteristic of modulation structure of Bi2201 system does not depend on the amount of the extra oxygen. The phonon frequencies of O\-\{Sr\} mode around 625 cm\+\{-1\} can be influenced by “charge transfer” effect and the variation of modulation structure. Crystal microstructural characteristic play an important role in influencing superconducting transition temperature and transport properties.

关 键 词：超导体 微结构 输运性质 Bi2201体系 RAMAN散射 

分 类 号：O511[理学—低温物理]