Mossbauer study of high-Tc, superconductor Bi2Sr2Ca1-xYx(Cu1-yFey57)2O8+z

被引：2

作者：

Arai, J ^{[1
]}

Yamagishi, T ^{[1
]}

机构：

[1] Sci Univ Tokyo, Fac Sci & Technol, Dept Phys, Chiba 278, Japan

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 1998年 / 177卷

关键词：

Mossbauer effect; superconductors; high-T-c;

D O I：

10.1016/S0304-8853(97)00348-X

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Fe-57 Mossbauer effects are measured at room temperature for the samples of high-T-c superconductor Bi2Sr2Ca1-xYx(Cu0.97Fe0.0357)(2)O8+z. The observed spectra can be divided into three doublet spectra, D-1, D-2 and D-3; D-1 and D-2 come from the Fe-57 probe surrounded by 5 oxygens like pyramidal and by 6-oxygen octahedron, respectively, and Dg comes from impurity phase. We have found that with hole reduction, the isomer shifts (IS) increase while their quadruple splitting (Eq) decrease almost linearly. Each of IS and Eq is analyzed by the increase of shield effect for nuclear charge and decrease of electric field gradient at nucleus due to the increase of Fe-3d electrons, respectively. This analysis reveals that the electrons in Fe-3d orbital increase by Delta n = 0.08 with increase of x = 0 to 1. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：515 / 516

页数：2