Structural, microstructural and magnetic properties of (La1-xCax)MnO3 nanoparticles

被引：11

作者：

Martinelli, A. ^{[1
]}

Ferretti, M. ^{[1
,2
]}

Castellano, C. ^{[3
]}

Cimberle, M. R. ^{[4
]}

Masini, R. ^{[4
]}

Peddis, D. ^{[5
,6
]}

Ritter, C. ^{[7
]}

机构：

[1] CNR SPIN, I-16152 Genoa, Italy

[2] Univ Genoa, Dipartimento Chim & Chim Ind, I-16146 Genoa, Italy

[3] Univ Milan, Dipartimento Chim Strutturale & Stereochim Inorga, I-20133 Milan, Italy

[4] CNR IMEM, I-16146 Genoa, Italy

[5] CNR ISM, I-00016 Rome, Italy

[6] Univ Cagliari, Dipartimento Sci Chim, I-09042 Cagliari, Italy

[7] Inst Laue Langevin, F-38042 Grenoble 9, France

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2013年 / 25卷 / 17期

关键词：

SIZE;

D O I：

10.1088/0953-8984/25/17/176003

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The crystal and magnetic structures of 10 and 20 nm sized (La1-xCax)MnO3 (x = 0.37, 0.50, 0.75) have been investigated between 5 and 300 K by means of Rietveld refinement of neutron powder diffraction data, coupled with transmission electron microscope observation and magnetization measurements. TEM observation reveals that nanoparticles are strongly affected by strain fields, probably originating from surface pressure. Irrespective of the composition, charge and orbital orderings are suppressed and F-z and C-y spin orderings coexist at low temperature; C-y and F-z orderings likely occur within the strained regions of the nanoparticles and in the matrix respectively. Moreover G(z) and A(z) orderings are sometimes observed, and are likely to be taking place at the border of the strained regions.

引用

页数：13

共 31 条

[1] Electron paramagnetic resonance study of size and nonstoichiometry effects on magnetic ordering in half-doped La0.5Ca0.5MnO3 manganite [J].