ON THE MOSSBAUER SITE ASSIGNMENT IN YBA2(CU1-XFEX)3OY

被引：30

作者：

BRAND, RA

SAUER, C

LUTGEMEIER, H

MEUFFELS, PM

ZINN, W

机构：

[1] IFF der KFA Jülich, Jülich, D-5170

来源：

HYPERFINE INTERACTIONS | 1990年 / 55卷 / 1-4期

关键词：

D O I：

10.1007/BF02397153

中图分类号：

O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];

学科分类号：

070203 ; 070304 ; 081704 ; 1406 ;

摘要：

The assignment of the four57Fe Mössbauer sites which are observed in Fe-substituted YBa2Cu3Oy is presented. We present a systematic study of highly-controlled samples with low Fe-concentration over the whole oxygen concentration range. Two sites are found to dominate in the limit of high oxidation (y→7), indentified as Fe4+ on the two crystallographic Cu sites: Cu(1) and Cu(2). These are replaced at lower oxidation (y→6) by two others, which we identify with Fe3+ on these same two sites. Consistency is found with the sign of the electric field gradient (EFG), the asymmetry parameter η and the isomer shift IS for this model. The magnetic structure in the limit y→6 shows changes in the antiferromagnetic (AF) structure dependent on iron concentration. Mössbauer and spin-echo NMR results show a change in the Cu(2) AF layer sequence at low temperatures, without any magnetic moments on the Cu(1) chain sites. © 1990 J.C. Baltzer A.G. Scientific Publishing Company.

引用

页码：1229 / 1242

页数：14

共 43 条

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