The effect of iron doping in La0.8Sr0.2Fe0.05Co0.95O3-δ perovskite

被引：13

作者：

Németh, Z

Klencsár, Z

Kuzmann, E

Homonnay, Z

Vértes, A

Grenèche, JM

Lackner, B

Kellner, K

Gritzner, G

Hakl, J

Vad, K

Mészáros, S

Kerekes, L

机构：

[1] Eotvos Lorand Univ, Dept Nucl Chem, H-1117 Budapest, Hungary

[2] Hungarian Acad Sci, Res Grp Nucl Methods Struct Chem, H-1051 Budapest, Hungary

[3] Univ Maine, Lab Phys Etat Condense, CNRS, UMR 6087, F-72085 Le Mans, France

[4] Johannes Kepler Univ Linz, Inst Chem Technol Inorgan Mat, A-4040 Linz, Austria

[5] Hungarian Acad Sci, Inst Nucl Res, H-4001 Debrecen, Hungary

来源：

EUROPEAN PHYSICAL JOURNAL B | 2005年 / 43卷 / 03期

关键词：

D O I：

10.1140/epjb/e2005-00057-y

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

(La0.8Sr0.2Fe0.05Co0.95O3-delta)-Fe-57 perovskite is investigated by (57) Fe transmission and emission Mossbauer spectroscopy, X-ray diffraction, AC magnetic susceptibility and magnetotransport measurements. Temperature dependence of the (57) Fe Mossbauer isomer shift, quadrupole splitting, magnetic hyperfine field, line broadening, and relative spectral area is presented in a detailed manner for (La0.8Sr0.2Fe0.05Co0.95O3-delta)-Fe-57. The oxidation state of iron is determined to be Fe3+, and the presence of preferential electronic charge compensation Fe3+ --> Fe4+ over that of Co3+ --> Co4+ is excluded. Relaxation of iron magnetic moments reflected by the Fe-57 Mossbauer spectra of La0.8Sr0.2 (Fe0.05Co0.95O3-delta)-Fe-57 are interpreted as evidence for the existence of superparamagnetic like Co clusters and a corresponding cluster glass magnetic phase formed below T approximate to 65 K.

引用

页码：297 / 303

页数：7

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