ORIGIN OF A BI-TYPE MODULATED STRUCTURE AND ITS EFFECTS ON SUPERCONDUCTIVITY IN BI1.8PB0.35SR2CA2CU3OY-DIRECT EXPERIMENTAL-OBSERVATION

被引：14

作者：

CHEN, XH ^{[1
]}

QIAN, YT ^{[1
]}

CHEN, ZY ^{[1
]}

LIN, C ^{[1
]}

YANG, L ^{[1
]}

MAO, ZQ ^{[1
]}

ZHANG, YH ^{[1
]}

机构：

[1] UNIV SCI & TECHNOL CHINA, CTR STRUCT & ELEMENTS ANAL, ANHUI 230026, PEOPLES R CHINA

来源：

PHYSICAL REVIEW B | 1992年 / 46卷 / 14期

关键词：

D O I：

10.1103/PhysRevB.46.9181

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Samples with nominal composition Bi1.8Pb0.35Sr2Ca2Cu3Oy annealed in oxygen and nitrogen atmospheres at 500 and 750-degrees-C are characterized by use of x-ray diffraction, magnetic measurements, oxygen-content determination, and electron diffraction. For samples annealed in an oxygen atmosphere, there exist two kinds of modulated structure: a Bi-type modulation and a Pb-type modulation. For samples annealed in N2 flow at 500-degrees-C, Bi-type modulations disappear completely, although Pb-type modulations remain almost unchanged; however, for samples annealed in N2 flow at 750-degrees-C, Pb-type modulations also disappear. It suggests that the Bi-type modulation originates from the extra oxygen in the Bi-O layers and the Pb-type modulation may arise not only from the excess oxygen but also from compositional modulations. T(c)'s of these samples are found not to change significantly with annealing conditions and varying oxygen content, and it is concluded that the modulated structure is not crucial to the superconductivity.

引用

页码：9181 / 9185

页数：5

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