HIGH-RESOLUTION STM STS STUDIES OF THE ROLE OF OXYGEN IN SUPERCONDUCTIVITY OF BI-2122 AND OPTIMIZATION OF TC

被引：48

作者：

AWANA, VPS ^{[1
]}

SAMANTA, SB ^{[1
]}

DUTTA, PK ^{[1
]}

GMELIN, E ^{[1
]}

NARLIKAR, AV ^{[1
]}

机构：

[1] MAX PLANCK INST FESTKORPERFORSCH,W-7000 STUTTGART 80,GERMANY

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 1991年 / 3卷 / 45期

关键词：

D O I：

10.1088/0953-8984/3/45/011

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The presence of excess oxygen intercalated in Bi-O redox layers has been found to be detrimental to the T(c) of the Bi-2122 phase. High resolution STM has been effectively used to locate intercalated oxygen and STS studies have revealed Bi-O layers becoming more insulating with intercalation. By suitable nitrogenation when the excess oxygen is depleted, more conducting redox layers give rise to an improved coupling between Cu-O planes of the neighbouring demi-unit cells in the c-direction, and it is this improved coupling that is responsible for enhanced T(c). In this way it has been possible to optimize T(c)(R = 0) for the single phase Bi-2122 cuprate at 96 K with a transition width of 3 K. which is the best value reported to date for the bulk ceramic sample of this material.

引用

页码：8893 / 8901

页数：9

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