Ferromagnetism and metallicity in the modulated Sr1-xThxCoO3-δ oxygen deficient perovskites with x≈0.1

被引：12

作者：

Hébert, S ^{[1
]}

Maignan, A ^{[1
]}

Caignaert, V ^{[1
]}

Pralong, V ^{[1
]}

Pelloquin, D ^{[1
]}

Raveau, B ^{[1
]}

机构：

[1] ENSICEAN, CNRS, Lab CRISMAT, UMR 6508, F-14050 Caen, France

来源：

SOLID STATE COMMUNICATIONS | 2005年 / 134卷 / 12期

关键词：

magnetically ordered media; chemical synthesis; electronic transport;

D O I：

10.1016/j.ssc.2005.03.031

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The Th4+ for Sr2+ substitution in SrCoO3-delta is found to be an efficient way to stabilize an oxygen deficient perovskite. The structural study reveals a Th4+ solubility limited to similar to 10% so that the chemical formula, Sr0.9Th0.1CoO2.79, is obtained. The comparison to the Y3+ for Sr2+ substitution shows that a lower oxygen content is obtained for the former according to the Sr0.75Y0.25CoO2.55 formula. The higher oxygen content reached with Th4+ has a strong impact on the physical properties:Sr0.9Th0.1CoO2.79 is an itinerant ferromagnet(T(C)similar to 200 K, rho(5) K =2 m Omega cm) whereas Sr0.75Y0.25CoO2.55 is a robust insulating antiferromagnet (T-N similar to 320 K, rho(5) K = 10(5) Omega cm). Clearly, the substitution of a tetravalent cation for Sr2+ appears to be a promising route to synthesize SrCoO3-delta itinerant ferromagnets without the use of high oxygen pressure nor electrochemical oxidation. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：815 / 820

页数：6

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