Optimization of superconducting transition temperature in (Pb0.7Cu0.3)Sr2(Ca0.5Y0.5)Cu2O7+δ by postannealing

S. F. Hu, D. A. Jefferson, R. S. Liu, P. P. Edwards

研究成果: 雜誌貢獻期刊論文同行評審

12 引文 斯高帕斯(Scopus)


We demonstrate systematic studies of the optimization of the superconducting transition temperature in (Pb0.7Cu0.3)Sr2(Ca0.5Y0.5)Cu2O7+δ by annealing in an oxygen atmosphere. As-sintered samples with a superconducting midpoint transition temperature, Tc(midpoint), of 18 K were prepared by solid state reaction at 1000°C for 1 hr in oxygen and then quenched in air. Subsequently, the samples were annealed in the temperature range between 700 and 1000°C for 12 hr in oxygen and then rapidly quenched in air. The ultimate Tc(midpoint) increased from 30 to 48 K with an increase in the annealing temperatures from 700 to 800°C, but a further increase in the annealing temperature of the samples from 800 to 1000°C resulted in a decrease in Tc(midpoint). Based on our studies, we believe that the optimum Tc(midpoint) of 48 K arises from the removal of excess oxygen in the insulating slabs of (Pb,Cu)O in (Pb0.7Cu0.3)Sr2 (Ca0.5Y0.5)Cu2O7+δ and this leads the material to approach an optimum hole concentration.

頁(從 - 到)455-460
期刊Journal of Solid State Chemistry
出版狀態已發佈 - 1992 二月

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

指紋 深入研究「Optimization of superconducting transition temperature in (Pb<sub>0.7</sub>Cu<sub>0.3</sub>)Sr<sub>2</sub>(Ca<sub>0.5</sub>Y<sub>0.5</sub>)Cu<sub>2</sub>O<sub>7+δ</sub> by postannealing」主題。共同形成了獨特的指紋。