Enhanced grain surface effect on magnetic properties of Pr0.57Ca0.43MnO3 nanomanganite

被引：1

作者：

Koushalya, P. R. ^{[1
]}

Anuradha, K. N. ^{[2
]}

机构：

[1] Don Bosco Inst Technol, Dept Phys, Bangalore 560074, Karnataka, India

[2] Dr Ambedkar Inst Technol, Dept Phys, Bangalore 560056, Karnataka, India

来源：

INTERNATIONAL JOURNAL OF NANOTECHNOLOGY | 2017年 / 14卷 / 9-11期

关键词：

charge order; nanomanganite; nanoparticles; core shell; INSULATOR-METAL TRANSITION; GIANT MAGNETORESISTANCE; PARTICLE-SIZE;

D O I：

10.1504/IJNT.2017.086774

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

In this paper, we study the enhanced grain surface effect on the magnetic properties of Pr0.57Ca0.43MnO3 (PCMO) nanomanganites. Nanoparticles OF PCMO were prepared by low cost sol-gel route and bulk sample was prepared by solid state reaction method. Crystallite size and structure of the samples were studied by X-ray diffraction (XRD) method. Surface morphology and compositional analysis were studied by scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDAX). Magnetisation measurements were carried out using superconducting quantum interference magnetometer (SQUID) in the temperature range of 10-300 K. The temperature dependence of field cooled magnetisation of bulk sample show charge order (CO) peak around 240 K and antiferromagnetic (AFM) transition at 170 K. Interestingly the charge order peak was found to be absent in 17 nm and 21 nm particles and both samples show ferromagnetic (FM) transition (TC) at 60 K and 90 K respectively. Melting of charge order and appearance of ferromagnetism in PCMO nanoparticles will be discussed with the help of core-shell model.

引用

页码：907 / 914

页数：8

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