摘要
A series of Hg-doped BaPb0.75Bi0.25O3 with a nominal composition of BaPb0.75-xHgxBi0.25O3 （x=0 to 0.40 with 0.05 intervals） have been synthesized by solid-state reaction. These compounds exhibit a cubic perovskite-related structure with the lattice parameter being expanded by Hg doping. Superconducting transition temperature Tc and superconducting volume fraction are suppressed by Hg doping in the low doping level region （0≤ x ≤0.25）. However, further increasing Hg content makes the superconductivity recovered at x〉0.3. The superconductivity suppression in Hg-doped BaPb0.75Bi0.25O3 can be explained by the decrease of electron carrier concentration as well as the bandnarrowing-induced electron localization.
A series of Hg-doped BaPb0.75Bi0.25O3 with a nominal composition of BaPb0.75-xHgxBi0.25O3 （x=0 to 0.40 with 0.05 intervals） have been synthesized by solid-state reaction. These compounds exhibit a cubic perovskite-related structure with the lattice parameter being expanded by Hg doping. Superconducting transition temperature Tc and superconducting volume fraction are suppressed by Hg doping in the low doping level region （0≤ x ≤0.25）. However, further increasing Hg content makes the superconductivity recovered at x〉0.3. The superconductivity suppression in Hg-doped BaPb0.75Bi0.25O3 can be explained by the decrease of electron carrier concentration as well as the bandnarrowing-induced electron localization.
基金
This work was supported by the National Science Foundation of China under Grant No. 50372052, 50588201
the National Basic Research Program of China (973 program) under Grant No. 2007CB616906
the Program for Changjiang Scholars and Innovative Research Team in University,
Australian Research Council under Grant No. DP0559872, DP0881739.
