Magnetic and transport and structure properties of the room temperature ferromagneto Sr1-xHoxCoO3-δ

被引：7

作者：

Balamurugan, S. ^{[1
]}

Yamaura, K. ^{[1
]}

Asthana, A. ^{[1
]}

Ubaldini, A. ^{[1
]}

Matsui, Y. ^{[1
]}

Takayama-Muromachi, E. ^{[1
]}

机构：

[1] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050044, Japan

来源：

JOURNAL OF APPLIED PHYSICS | 2008年 / 103卷 / 07期

基金：

日本学术振兴会;

关键词：

D O I：

10.1063/1.2834238

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The perovskite Sr(1-x)Ho(x)CoO(3-delta) shows room temperature ferromagnetism (T(c)similar to 335 K) in a severely limited composition range 0.2 <= x <= 0.25. The formal Co valence is almost constant at +3 regardless of the Ho concentration (x >= 0.2); thus, the high-spin state or the intermediate spin state of 3d(6) Co should be mainly responsible for the magnetism. The ferromagnetism was found to accompany the formation of a superstructure 2a(p) x 2a(p) x 4a(p) (a(p) denotes a cubic perovskite cell). Besides, an additional superstructure 4(2a(p)) x 4(2a(p)) x (4a(p)) was found at x = 0.225, where the ferromagnetic volume in magnetic susceptibility was largest. The data suggest that the formation of the multiple superstructures probably plays a key role to establish the peculiar ferromagnetism. (c) 2008 American Institute of Physics.

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