POSITRON ANNIHILATION STUDY OF YBa2(Cu1-xSnx)3Oy SUPERCONDUCTORS
CHEN ANG (陈昂)a, ZHI YU (智宇)a, LI BIAO-RONG (李标荣)b, ZHANG XU-LI (张绪礼)b, TANG CHAO-QUN (唐超群)b, LI XIAO-HUA (李晓华)c, WANG SHAO-JIE (王少阶)c
a Department of Physics, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China; bDepartment of Soild State Electronics, Department of Physics. Huazhong University of Science and Technology, Wuhan 430074, China; c Department of Physics, Wuhan University, Wuhan 430071, China
Abstract The positron annihilation lifetime spectra and their temperature dependence for the YBa2Cu3Oy superconducting ceramics doped with Sn have been studied. The resutts of analyses indicate that the element Sn is substituted for Cu(1) sites, and this leads to the ordering of the oxygen atoms as well as the increase of local electronic density in the Cu(1)-O layer where Cu(1) is substituted by Sn.
Received: 15 November 1991
Accepted manuscript online:
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