Magnetic and transport properties of high-pressure synthesized perovskite cobalt oxide (Sr1-xCax)CoO3 (0 ≤ x ≤ 0.8)

被引：18

作者：

Balamurugan, S ^{[1
]}

Xu, M ^{[1
]}

Takayama-Muromachi, E ^{[1
]}

机构：

[1] NIMS, Superconducting Mat Ctr, Tsukuba, Ibaraki 3050044, Japan

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2005年 / 178卷 / 11期

基金：

日本学术振兴会;

关键词：

perovskite; (Sr; Ca)CoO3; HP-HT synthesis; ferromagnetism;

D O I：

10.1016/j.jssc.2005.08.019

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Polycrystalline perovskite cobalt oxides (Sr1-xCax)CoO3 (0 <= x <= 0.8) were synthesized under high pressure (6 GPa) and high temperature (1200-1300 degrees C) conditions. Powder X-ray diffraction data confirmed that they have cubic perovskite structures. The end member of the solid solution, SrCoO3, exhibited a ferromagnetic transition with Curie temperature of T(c)similar to 266K and metallic electric conductivity. With increasing the Ca content x, T-c increased slightly to 286 K at x = 0.2 then decreased rapidly to 148 K for x = 0.8. The origin of the ferromagnetism is discussed in relation to the spin state of the Co4+ ions. The present system showed a relatively large (similar to 5.5%) negative magnetoresistance for x = 0 or 0.2 in the vicinity of Tc. (c) 2005 Elsevier Inc. All rights reserved.

引用

页码：3431 / 3436

页数：6

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