High-Pressure Synthesis of Superconducting (Ba1-xSrx)2Cu1+yO2+2y+δ(CO3)1-y (0.35≤x≤0.6, y≈0.1)
- 1 July 1992
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 31 (7A) , L832-834
- https://doi.org/10.1143/jjap.31.l832
Abstract
A new copper-oxide superconductor containing carbon (Ba1-x Sr x )2Cu1+y O2+2y+δ(CO3)1-y (0.35≤x≤0.6, y≈0.1), which is structurally related to Sr2CuO2CO3, was synthesized under high oxygen pressures of more than 5 atm. The onset temperature for superconduction T c(onset) increased with oxygen partial pressure (P O2 ) during synthesis. Optimum P O2 was about 50 atm and (Ba0.55Sr0.45)2Cu1.1O2.2+δ(CO3)0.9 synthesized under 50 atm O2 showed a T c(onset) of about 40 K and a T c(zero) of about 26 K.Keywords
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