Modulation of the ferromagnetic insulating phase in Pr0.8Ca0.2MnO3 by Co substitution

被引：6

作者：

Harada, T. ^{[1
]}

Ohkubo, I. ^{[1
]}

Lippmaa, M. ^{[2
]}

Matsumoto, Y. ^{[3
]}

Sumiya, M. ^{[4
]}

Koinuma, H. ^{[5
]}

Oshima, M. ^{[1
,6
,7
]}

机构：

[1] Univ Tokyo, Dept Appl Chem, Bunkyo Ku, Tokyo 1138656, Japan

[2] Univ Tokyo, Inst Solid State Phys, Chiba 2778581, Japan

[3] Tokyo Inst Technol, Mat & Struct Lab, Yokohama, Kanagawa 2268503, Japan

[4] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050044, Japan

[5] Univ Tokyo, Grad Sch Frontier Sci, Chiba 2778568, Japan

[6] Japan Sci & Technol Agcy JST, CREST, Chiyoda Ku, Tokyo 1020075, Japan

[7] Univ Tokyo, Synchrotron Radiat Res Org, Tokyo 1138656, Japan

来源：

PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS | 2011年 / 5卷 / 01期

关键词：

epitaxy; thin films; pulsed laser deposition; magnetism; oxides; DOPED MANGANITES; STATE; TRANSITION; TRANSPORT;

D O I：

10.1002/pssr.201004467

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Ferromagnetic insulator Pr0.8Ca0.2Mn1-yCoyO3 (0 <= y <= 0.7) thin films were epitaxially grown by pulsed laser deposition on substrates of (LaAlO3)O-3(SrAl0.5Ta0.5O3)(0.7) (100). To probe the ferromagnetic insulator state, the Co content dependences of the structural, magnetic, and transport properties were studied. Variation of lattice constant by the Co substitution is well reproduced considering that divalent and trivalent Co ions substitute for Mn ions at the perovskite B-sites. For 0 <= y <= 0.3, the Curie temperature, saturation magnetization, and magnetoresistance increase with increasing Co content, retaining the insulating properties. Detailed analyses of transport and magnetic properties indicate the contribution of both double exchange and superexchange interactions to the appearance of the ferromagnetic insulating phase. (C) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

引用

页码：34 / 36

页数：3

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