A monoclinic manganite, La0.9MnO3-delta, with colossal magnetoresistance properties near room temperature

被引：69

作者：

Maignan, A ^{[1
]}

Michel, C ^{[1
]}

Hervieu, M ^{[1
]}

Raveau, B ^{[1
]}

机构：

[1] UNIV CAEN,F-14050 CAEN,FRANCE

来源：

SOLID STATE COMMUNICATIONS | 1997年 / 101卷 / 04期

关键词：

D O I：

10.1016/S0038-1098(96)00533-9

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The investigation of the La-Mn-O system has allowed manganites La0.90MnO3-delta with colossal magnetoresistance properties, near room temperature, to be isolated. These phases exhibit indeed a ferromagnetic metallic to paramagnetic insulating transition, with T-C ranging from 230 K to 260 K, depending on the hole carrier density (delta = 0.05-0.06). A resistance ratio of 6 in a magnetic field of 7 T is observed near room temperature (260 K) for the first time in the La-Mn-O system. The CMR La0.9MnO3-delta phases, can be indexed in a classical rhombohedral cell, but their electron diffraction and X-ray powder study shows that their symmetry is monoclinic I2/a with a=7.790(1)Angstrom, b=5.526(1)Angstrom, c=5.479(1)Angstrom, beta=90.78 degrees. Decreasing slightly the oxygen content leads to orthorhombic phases and kills the CMR properties. Copyright (C) 1996 Elsevier Science Ltd

引用

页码：277 / 281

页数：5