铁掺杂Tl－1223超导相的额外氧缺陷研究  

EXTRA OXYGEN DEFECT INDUCED BY Fe DOPING IN Tl SYSTEM SUPERCONDUCTOR

作　　者：李阳[1,2,3,4] 曹国辉[1,2,3,4] 王耘波[1,2,3,4] 马庆珠[1,2,3,4] 熊小涛[1,2,3,4] 马如璋[1,2,3,4] 陈宁[1,2,3,4] 郭应焕[1,2,3,4] 许祝安[5] 张晓俊[5] 王劲松[5] 焦正宽[5] 彭获田 周思海[6] 

机构地区：[1]北京科技大学材料物理系 [2]中国科学院国际材料物理中心 [3]中国科学院核分析技术开放实验室 [4]中国科学院国家超导实验室 [5]浙江大学物理系 [6]长沙矿冶研究院

出　　处：《物理学报》1996年第9期1570-1577,共8页Acta Physica Sinica

基　　金：国家超导技术联合研究开发中心资助

摘　　要：在铁掺杂的Ｔｌ１２２３相中，铁对超导电性有明显的破坏作用，霍尔系数测量、热重分析和穆斯堡尔谱表明占据铜晶位的铁杂质原子不仅直接破坏ＣｕＯ２面的完整性而使超导转变温度降低，更重要的是铁的掺入诱导了额外氧原子进入晶格，形成了对载流子的强局域束缚作用，致使载流子浓度随铁掺杂量呈线性下降．额外氧导致了与其近邻的铁和铜原子产生了偏离ＣｕＯ２平面的位移，从而形成新的铁氧配位．针对额外氧缺陷精细结构的讨论。In Fe doped Tl 1223 superconducting phase, Fe dopants significantly destroy superconductivity. Hall coefficient, thermogravimetric measurements and Mssbauer effect show that Fe dopants not only directly destroy the integrity of Cu O layers to low superconducting transition temperature, but also induce extra oxygen to enter lattice. These extra oxygen defects can strengtheningly bind carriers in Cu O layers, Such binding effect gives rise to decreasing of the carrier density with Fe doping level increasing. In addition, the extra oxygen results in a deviation of its neibouring Fe(Cu) from center of Cu O network, and form a new Fe O coordination. It is important for high T c superconducting mechanism to study the structural details and carrier binding effect of extra oxygen defect on superconductivity.

关 键 词：高TC 超导体 铁掺杂 氧化物超导体 氧缺陷 

分 类 号：TM262[一般工业技术—材料科学与工程]