Influence of A-site size and disorder on metamagnetic transformation in A-site substituted Pr0.5Ca0.5MnO3

被引：12

作者：

Zhu, Deliang ^{[1
]}

Tan, Xiaoan

Cao, Peijiang

Jia, Fang

Ma, Xiaocui

Lu, Youming

机构：

[1] Shenzhen Univ, Coll Mat Sci & Engn, Shenzhen 518060, Peoples R China

来源：

JOURNAL OF APPLIED PHYSICS | 2009年 / 105卷 / 06期

基金：

中国国家自然科学基金; 芬兰科学院;

关键词：

barium compounds; calcium compounds; distortion; ferromagnetic materials; magnetic transitions; magnetisation; metamagnetism; praseodymium compounds; HIGH-MAGNETIC-FIELD; CHARGE; TRANSITION; MANGANITES; PHYSICS;

D O I：

10.1063/1.3098228

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The influence of A-site size and disorder on metamagnetic transformation in polycrystalline Pr0.5-xLaxCa0.5MnO3 and Pr0.5Ca0.5-xBaxMnO3 at low temperature has been systematically investigated. The introduction of larger A-site cations such as La3+ or Ba2+ will locally suppress the lattice distortion. This "counterdistortion" effect becomes more pronounced with the increase in the A-site average ionic radius < r(A)>, which is favorable to ferromagnetism. Thus the critical field H-C1 corresponding to the first sharp metamagnetic step will decrease, and the field-induced magnetization M-5 T will increase. However, the A-site ionic radii variance sigma(2) will dramatically increase when more barium is introduced and a spin glasslike state is induced, which is unfavorable to the stability of ferromagnetism state. Therefore, H-C1 will increase and M-5 T will decrease. Moreover, the evolution of resistivity at low temperature with sigma(2) exhibits strong correlation with that of magnetic properties.

引用

页数：5

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