Structural features of the La-Sr-Fe-Co-O system

被引：13

作者：

Cziráki, A

Geröcs, I

Köteles, M

Gábris, A

Pogány, L

Bakonyi, I

Klencsár, Z

Vértes, A

De, SK

Barman, A

Ghosh, M

Biswas, S

Chatterjee, S

Arnold, B

Bauer, HD

Wetzig, K

Ulhaq-Bouillet, C

Pierron-Bohnes, V

机构：

[1] Eotvos Lorand Univ, Dept Solid State Phys, H-1518 Budapest, Hungary

[2] Hungarian Acad Sci, Res Inst Solid State Phys & Opt, H-1525 Budapest, Hungary

[3] Eotvos Lorand Univ, Dept Nucl Chem, Hungarian Acad Sci, Res Grp Nucl Methods Struct Chem, H-1518 Budapest, Hungary

[4] Indian Assoc Cultivat Sci, Dept Mat Sci, Kolkata 700032, W Bengal, India

[5] Zent Inst Festkorperphys & Werkstofforsch, D-01069 Dresden, Germany

[6] Inst Phys & Chim Mat Strasbourg, UMR C75040 CNRS, ULP, F-67037 Strasbourg, France

来源：

EUROPEAN PHYSICAL JOURNAL B | 2001年 / 21卷 / 04期

关键词：

D O I：

10.1007/PL00011125

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

A structural study has been performed on the La0.8Sr0.2FexCo1-xO3 (x = 0.025 to 0.3) system displaying large magnetoresistance (MR) at room temperature. A detailed analysis of the crystal structure and microstructure was done by X-ray diffraction (XRD), transmission and scanning electron microscopy (TEM and SEM). The atomic resolution TEM images and the appearing superreflections in the corresponding SAED patterns revealed that a superstructure is formed due to the presence of iron. The correlation between the ordered microstructure and the observed large MR ratio is discussed. Fe-57 Mossbauer spectroscopy was utilized to gain information on the valence state of iron in the sample with x = 0.3. The lattice parameters of Fe- doped La0.8Sr0.2FexCol- xO3 compounds were found to increase monotonously with increasing Fe content. The valence state of iron was found to be Fe3+.

引用

页码：521 / 526

页数：6

共 17 条

[1] Giant magnetoresistance in La0.8Sr0.2FexCo1-xO3 (0.025<=X<=0.3) [J].