Direct visualization of cubic to tetragonal phase transition in La0.2Sr0.8MnO3-δ using transmission electron microscopy

被引：2

作者：

Shahee, Aga ^{[1
]}

Lalla, Niranjan Prasad ^{[1
]}

机构：

[1] UGC DAE Consortium Sci Res, Indore 452001, Madhya Pradesh, India

来源：

PHYSICA B-CONDENSED MATTER | 2014年 / 448卷

关键词：

Manganite; Coupled phase transition; Low temperature transmission electron microscopy; Low temperature x-ray diffraction; MANGANITES; CHARGE; MAGNETORESISTANCE; LA0.5CA0.5MNO3; DIFFRACTION; DIAGRAM;

D O I：

10.1016/j.physb.2014.02.055

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Structural phase transition studies employing low-temperature transmission electron microscopy (LT-TEM) and low-temperature x-ray diffraction (LT-XRD) have been carried out on wide-band La0.2Sr0.8MnO3-delta (delta=0.01) manganite. These studies reveal clear evidence of cubic to tetragonal phase transition occurring below 260 K in La0.2Sr0.8MnO3-delta (delta=0.01). TEM observations depict that cubic to tetragonal phase-transition results in formation of nanotwinned microstructure of the tetragonal phase. Formation of nanotwins has been attributed to orbital-orientation phase-separation leading to minimization of strain. The magnetic and electron transport measurements reveal that the structural phase transition is coupled with a canted C-type antiferromagnetic and semi-conductor to insulating phase transition. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：290 / 296

页数：7

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