Induced ferromagnetism and colossal magnetoresistance by Ir-doping in Pr1-xCaxMnO3

被引：15

作者：

Hébert, S ^{[1
]}

Maignan, A ^{[1
]}

Frésard, R ^{[1
]}

Hervieu, M ^{[1
]}

Retoux, R ^{[1
]}

Martin, C ^{[1
]}

Raveau, B ^{[1
]}

机构：

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

来源：

EUROPEAN PHYSICAL JOURNAL B | 2001年 / 24卷 / 01期

关键词：

D O I：

10.1007/s100510170025

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The doping of the manganese site by iridium (up to 15%) in the small A cation manganites Pr1-xCaxMnO3 (0.4 less than or equal to x less than or equal to 0.8), has been investigated as a new method to suppress charge-ordering and induce CMR effects. Ir doping leads to ferromagnetism and to insulator to metal transitions, with high transition temperatures reaching 180 K and CMR ratio in 7 T as large as 10(4). The efficiency with which iridium induces ferromagnetism and CMR is compared to previous results obtained with other substitutions (Ru, Rh, Ni, Cr...). The ionic radius of the foreign cations and their mixed-valencies are found to be the main parameters governing the ability to collapse the charge-ordered state.

引用

页码：85 / 89

页数：5

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