Magnetoresistance in the oxygen deficient LnBaCo(2)O(5.4) (Ln=Eu, Gd) phases

被引：299

作者：

Martin, C

Maignan, A

Pelloquin, D

Nguyen, N

Raveau, B

机构：

[1] ISMRA UNIV, LAB CRISMAT, F-14050 CAEN, FRANCE

[2] UNIV CAEN, CNRS 6, UMR 6508, F-14050 CAEN, FRANCE

来源：

APPLIED PHYSICS LETTERS | 1997年 / 71卷 / 10期

关键词：

D O I：

10.1063/1.119912

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

New ''112'' phases, LnBaCo(2)O(5.4), with an ordered oxygen deficient perovskite structure, derived from the YBaFeCuO5-type were studied for Ln = Eu, Gd. The appearance of giant negative magnetoresistance in this structural type is demonstrated. Resistance ratio R-0/R-7 T reaches at least 10 at 10 K, i.e., is significantly larger than those observed in the other cobalt perovskites, such as La1-xSrxCoO3. These properties are linked to an original magnetic behavior of these materials that exhibit two types of transition-antiferromagnetic to ferromagnetic, and ferromagnetic to paramagnetic-as T increases. This magnetic behavior may be related to a possible I.S. and L.S. spin ordering of trivalent cobalt in pyramidal and octahedral coordinations, respectively. (C) 1997 American Institute of Physics.

引用

页码：1421 / 1423

页数：3

共 20 条

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