Substitution and magnetic properties of Pb-1212

被引：8

作者：

Glaser, J

Ehmann, A

Seling, B

Losch, S

Zoller, P

Wischert, W

KemmlerSack, S

Linhart, J

Reimers, W

机构：

[1] UNIV TUBINGEN,INST ANORGAN CHEM,D-72076 TUBINGEN,GERMANY

[2] HAHN MEITNER INST BERLIN GMBH,D-14109 BERLIN,GERMANY

来源：

PHYSICA C | 1997年 / 276卷 / 1-2期

关键词：

D O I：

10.1016/S0921-4534(97)00025-7

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A combined study of X-ray and neutron powder diffraction on (Pb0.75Cu0.25)Sr2Y0.8Ca0.2Cu2Oz indicates that the rocksalt-like AO monolayers between the perovskite blacks are strongly distorted. By variation of the carrier concentration in the perovskite blocks via a substitution Ca2+ --> Y3+ in the system (Pb0.75Cu0.25)Sr2Y1-xCaxCu2Oz superconductivity is introduced with T-c around 40 K. Doping of the AO layers via a substitution Bi3+ --> Pb4+ in the system (Pb0.75-yBiyCu0.25)Sr2Y0.8Ca0.2Cu2Oz has a more pronounced effect. Transition from a non-superconducting material with y = 0 to a bulk superconductor with y = 0.3 and T-c = 96 K is observed. Post-treatment in flowing Ar shifts T-c for y = 0.3 to 100 K. A simultaneous variation of the carrier concentration in the perovskite blocks in the system (Pb0.75-yBiyCu0.25)Sr-2-Y1-xCaxOz is of subordinate effect.

引用

页码：91 / 100

页数：10

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