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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收藏

页码：469 / 474

页数：6

相关论文

共 31 条

[21] CMR effect in electron-doped manganites Ca1-xSmxMnO3 [J].

Martin, C ;

Maignan, A ;

Damay, F ;

Hervieu, M ;

Raveau, B .

JOURNAL OF SOLID STATE CHEMISTRY, 1997, 134 (01) :198-202

[22] Solid state physics - Phase separation scenario for manganese oxides and related materials [J].

Moreo, A ;

Yunoki, S ;

Dagotto, E .

SCIENCE, 1999, 283 (5410) :2034-2040

[23] Static and dynamic response of cluster glass in La0.5Sr0.5CoO3 [J].

Mukherjee, S ;

Ranganathan, R ;

Anilkumar, PS ;

Joy, PA .

PHYSICAL REVIEW B, 1996, 54 (13) :9267-9274

[24] Ru-induced ferromagnetism and metallicity in Mn(IV)-rich manganites Ln0.4Ca0.6MnO3 [J].

Raveau, B ;

Maignan, A ;

Martin, C ;

Mahendiran, R ;

Hervieu, M .

JOURNAL OF SOLID STATE CHEMISTRY, 2000, 151 (02) :330-334

[25] Insulator-metal transition induced by Cr and Co doping in Pr0.5Ca0.5MnO3 [J].

Raveau, B ;

Maignan, A ;

Martin, C .

JOURNAL OF SOLID STATE CHEMISTRY, 1997, 130 (01) :162-166

[26]

RESPAUD M, 2000, P 18 GEN C COND MATT, P204

[27] REVISED EFFECTIVE IONIC-RADII AND SYSTEMATIC STUDIES OF INTERATOMIC DISTANCES IN HALIDES AND CHALCOGENIDES [J].

SHANNON, RD .

ACTA CRYSTALLOGRAPHICA SECTION A, 1976, 32 (SEP1) :751-767

[28] Magnetic moments in (Cr and Ni) doped CMR manganites as seen by soft X-ray Magnetic Circular Dichroism [J].

Studer, F ;

Toulemonde, O ;

Goedkoop, J ;

Barnabe, A ;

Raveau, B .

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 1999, 38 :377-380

[29] ANOMALOUS MAGNETOTRANSPORT PROPERTIES OF PR1-XCAXMNO3 [J].

TOMIOKA, Y ;

ASAMITSU, A ;

MORITOMO, Y ;

TOKURA, Y .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1995, 64 (10) :3626-3630

[30] Percolative phase separation underlies colossal magnetoresistance in mixed-valent manganites [J].

Uehara, M ;

Mori, S ;

Chen, CH ;

Cheong, SW .

NATURE, 1999, 399 (6736) :560-563

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