Effect of Pb doping in high-T-c Bi2Sr2CaCu2Oy superconductors studied by X-ray absorption near-edge structure spectroscopy
Journal
Physica C
Journal Volume
364
Pages
567-570
Date Issued
2001
Author(s)
Abstract
An investigation of the variation of hole concentration within the CuO2 planes using X-ray absorption near-edge structure spectroscopy with synchrotron radiation in the (Bi2-xPbx)Sr2CaCu2O y (0≤x≤0.3) series of high-Tc superconductors synthesized by solid-state reaction in air is presented. Pb is found to have the valence of +2 in the samples of this series. Moreover, the hole concentration increases with increasing Pb content. The results lead us to conclude that the substitution of Pb2+ in the Bi3+ sites of the (Bi, Pb)-2212 system causes the compounds to be in the over-doped state. This effect results in the compounds having a high critical current density. © 2001 Elsevier Science B.V. All rights reserved.
SDGs
Type
journal article