The "1201" bismuth based cobaltite Bi0.5Cd0.3Sr2Co1.2O5-δ:: A new magnetoresistant spin glass like insulator

被引：14

作者：

Groult, D ^{[1
]}

Martin, C ^{[1
]}

Maignan, A ^{[1
]}

Pelloquin, D ^{[1
]}

Raveau, B ^{[1
]}

机构：

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

来源：

SOLID STATE COMMUNICATIONS | 1998年 / 105卷 / 09期

关键词：

D O I：

10.1016/S0038-1098(97)10198-3

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

A new "1201" bismuth based cobaltite, Bi0.5Cd0.3Sr2Co1.2O5-delta, has been synthesized. Its single crystal structure determination shows that this tetragonal phase [a = 3.7765(1) Angstrom, c = 8.7812(3) Angstrom] exhibits regular single perovskite layers [SrCoO3](infinity) characterized by an elongation of the CoO6 octahedra, whereas the rock salt layers [Bi0.5Cd0.3Co0.2SrO2-delta](infinity) exhibits disordered phenomena especially concerning the distribution of the metallic species and splitting of the oxygen positions in the intermediate layer [(Bi, Cd, Co)O]. The most important feature of this oxide deals with its spin glass like behavior (T-cusp = 49 K) and negative magnetoresistance properties (MR% = 23% at 70 K). The latter are interpreted in terms of competition between double-exchange (Co3+-Co4+ ferromagnetic interactions) and superexchange (Co3+-Co3+ and Co4+-Co4+ antiferromagnetic interactions). (C) 1998 Elsevier Science Ltd.

引用

页码：583 / 588

页数：6

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