Hexagonal perovskite cobaltites:: Unconventional magnetism at low temperature

被引：21

作者：

Hebert, S. ^{[1
]}

Pralong, V. ^{[1
]}

Pelloquin, D. ^{[1
]}

Maignan, A. ^{[1
]}

机构：

[1] ENSICAEN, CNRS, Lab CRISMAT, F-14050 Caen 4, France

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2007年 / 316卷 / 02期

关键词：

cobaltite; perovskite; magnetization jump; magnetoresistance; ferromagnetism;

D O I：

10.1016/j.jmmm.2007.03.143

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The magnetic properties of three hexagonal perovskites-Ca3Co2O6, the 2H- and 12H-BaCoO3-delta-have been studied by magnetization (M) measurements. In the latter, the isothermal magnetic field driven M(H) curves reveal M jumps for the lowest T( = 2K), which are not observed in the 2H-BaCoO3 1D compound. The comparison to the M steps found in Ca3Co2O6 points towards a different origin in the case of the 12H-BaCoO3-delta perovskite. This suggests that the pinning of the domain walls in this ferromagnet is made by a narrow distribution of critical fields of the nucleation growth responsible for these very reproducible M jumps. A clear relationship to the 3D structural character of the 12H perovskite is also made. (c) 2007 Elsevier B.V. All rights reserved.

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页码：394 / 399

页数：6

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