Structural phase transition at low temperature, corresponding to charge ordering in the CMR perovskites LN(0.5)A(0.5)MNO(3)

被引：28

作者：

Laffez, P ^{[1
]}

VanTendeloo, G ^{[1
]}

Millange, F ^{[1
]}

Caignaert, V ^{[1
]}

Hervieu, M ^{[1
]}

Raveau, B ^{[1
]}

机构：

[1] UNIV CAEN,ISMRA,LAB CRISMAT,F-14050 CAEN,FRANCE

来源：

MATERIALS RESEARCH BULLETIN | 1996年 / 31卷 / 08期

关键词：

magnetic materials; electron microscopy; magnetic properties; phase transitions;

D O I：

10.1016/S0025-5408(96)00090-6

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The magneto resistive perovskites Nd0.5Sr0.5MnO3 and Pr0.5Sr0.41Ca0.09MnO3 undergo a transition from anti ferromagnetic insulator to ferromagnetic metal as function of temperature. The room temperature phase is orthorhombic with the space group Imma and the cell parameters a approximate to root 2a(p), b approximate to 2a(p), and c approximate to root 2a(p). A structural phase transition related to charge ordering accompanying the transition from ferromagnetic state to antiferromagnetic state has been evidenced by low temperature electron diffraction. This transition is reversible and a new superstructure, with a P-type orthorhombic cell. and lattice parameters parameters a approximate to 2 root 2a(p), b approximate to 2a(p), and c approximate to root 2a(p), is formed.

引用

页码：905 / 911

页数：7

共 22 条

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