摘要
Bulk superconductivity was observed in the new system (In xPb0.75-xCu0.25)Sr2(Ca 0.5Y0.5)Cu2 O7-δ. An increase in indium doping, 0≤x≤0.2, into the Pb sites results in an increase in the superconducting transition temperature Tc from 45 K for x=0 to 60 K for x=0.2. For nominal compositions x≳0.2, a decrease in Tc was observed, and an increase in the concentration of an impurity phase. From the results of the x-ray diffraction and energy- dispersive spectrometry, we identify the phase responsible for the superconductivity to be [In 0.06(1)Pb0.69(1)Cu0.25]Sr 1.99(7)[Ca0.47(1)Y 0.53(2)]Cu2O 7-δ; this phase resulted from the synthesis of a sample of nominal composition (In0.2Pb0.55Cu0.25)Sr 2(Ca0.5Y0.5)Cu2 O 7-δ.
原文 | 英語 |
---|---|
頁(從 - 到) | 985-987 |
頁數 | 3 |
期刊 | Applied Physics Letters |
卷 | 59 |
發行號 | 8 |
DOIs | |
出版狀態 | 已發佈 - 1991 |
對外發佈 | 是 |
ASJC Scopus subject areas
- 物理與天文學(雜項)