Extension of ferromagnetism and metallicity to electron-rich manganites by Ru-doping:: Generation of new CMR oxides Sm0.2Ca0.8Mn1-xRuxO3

被引：42

作者：

Martin, C

Maignan, A

Hervieu, M

Raveau, B

Hejtmanek, J

机构：

[1] Inst Sci Mat & Rayonnement, Lab CRISMAT, CNRS, UMR 6508, F-14050 Caen, France

[2] ASCR, Inst Phys, Prague 16253 6, Czech Republic

来源：

EUROPEAN PHYSICAL JOURNAL B | 2000年 / 16卷 / 03期

关键词：

D O I：

10.1007/s100510070205

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The doping of Mn site with ruthenium, in the n-type manganite Sm0.2Ca0.8MnO3, has been studied using magnetic and transport measurements. We show that Ru induces a ferromagnetic metallic state at low temperature in this Mn4+ rich compound, a metal to metal transition replacing the metal to insulator one in the pristine phase. A spectacular increase of T-C up to 240 K is achieved, together with CMR effect. Based on thermoelectric power measurements, we propose that Ru(V) could be at the origin of these exceptional properties, due to ferromagnetic superexchange interactions between Ru(V) and Mn(III), forming in a first step ferromagnetic metallic clusters in the C-type antiferromagnetic insulating matrix.

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页码：469 / 474

页数：6

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