Coexistence and competition of ferromagnetic and charge ordered phases in strained La1-xCaxMnO3 films

被引：6
|
作者：
Vlakhov, ES
Nenkov, KA
Donchev, TI
Mateev, ES
Chakalov, RA
Szewczyk, A
Baran, M
Piotrowski, K
机构：
[1] Int Lab High Magnet Fields & Low Temp, PL-53421 Wroclaw, Poland
[2] Bulgarian Acad Sci, Inst Solid State Phys, BU-1784 Sofia, Bulgaria
[3] Zent Inst Festkorperphys & Werkstofforsch, D-01171 Dresden, Germany
[4] Bulgarian Acad Sci, Inst Elect, BU-1784 Sofia, Bulgaria
[5] Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England
[6] Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2005年 / 290卷
关键词：
manganites; magneto resistance; strained thin filins; percolation;
D O I：
10.1016/j.jmmm.2004.11.299
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Magnetotransport properties of thin films of La1-xCaxMnO3 (x = 0.3; 0.51) deposited on LaAlO3 and SrTiO3 substrates were investigated. Compressively strained La0.7Ca0.3MnO3 layers reveal semiconducting behaviour and charge ordered insulating (COI) phase which melts to ferromagnetic metallic (FMM) above a certain magnetic field, accompanied by a significant hysteresis. The La0.49Ca0.51MnO3 samples possess stable COI state. Variable range Hopping mechanism well describes the conductance in zero magnetic field. Magnetotransport properties of strained thin films are consistent with the phase segregation model, i.e. with the coexistance and competition of COI and FMM phases. (c) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码：955 / 958
页数：4
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