PAT study on stress-field pinning in high-T c superconductors

Authors :: Wenhua Wang
Guohui Cao
Tianbao Zhang
Chunguang Tang
Yunbo Wang
Yang Li
Qingzhu Ma
Long Wei
Source :: Science in China Series A: Mathematics. 40:978-984
Publication Year :: 1997
Publisher :: Springer Science and Business Media LLC, 1997.
Abstract: The simultaneous measurements of Doppler-broadened radiation spectra and lifetime spectra were performed by positron annihilation analysis on Eu-doped Y-123 superconductors. When the doping concentration reaches 30% and 70%, the density of defeat and its stress-field reach the maximum for (Y1-x Eu x )Ba2CU3O7-y The pinning mechanism of such superconductors is discussed, and the results support the stress pinning mechanism.