Composition Dependence on the Superconducting Properties of Bi-Pb-Sr-Ca-Cu-O

1 February 1989

journal article
Published by IOP Publishing in Japanese Journal of Applied Physics

Vol. 28 (2A) , L190
https://doi.org/10.1143/jjap.28.l190

Abstract

Superconductors with a nominal composition close to the ideal high-T _c phase, (Bi, Pb)₂Sr₂Ca₂Cu₃O_y, were prepared to study the effect of composition variation on the superconducting properties. It was found that the deviation from the ideal composition delicately affects the T _c(0), and that even a small surplus of Ca and Cu is enough to make it lower to around 95 K. In order to obtain a pure 110 K phase which allows a large current flow to yield a T _c(0) above 100 K, the composition must be strictly controlled around Sr:Ca:Cu=2:2:3 with the smallest excess of Ca and Cu. Lead was revealed to occupy Bi sites supplying positive holes to the system along with Sr defects.

Keywords

This publication has 3 references indexed in Scilit:

Preparation of Single 110 K Phase of the Bi-Pb-Sr-Ca-Cu-O Superconductor
Japanese Journal of Applied Physics, 1988
Preparation of the High-T_c Phase of Bi-Sr-Ca-Cu-O Superconductor
Japanese Journal of Applied Physics, 1988
A New High-T_c Oxide Superconductor without a Rare Earth Element
Japanese Journal of Applied Physics, 1988