Low-field magnetoresistance of La0.7Ca0.3MnO3 perovskite synthesized by reactive milling method

被引：23

作者：

Manh, D. H. ^{[1
]}

Phong, P. T.

Thanh, T. D. ^{[1
]}

Hong, L. V. ^{[1
]}

Phuc, N. X. ^{[1
]}

机构：

[1] Vietnam Acad Sci & Technol, Inst Mat Sci, Hanoi, Vietnam

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2010年 / 499卷 / 02期

关键词：

Manganite; Low-field magnetoresistance; Grain size; Spin-polarized tunneling; TRANSPORT-PROPERTIES; MAGNETIC-PROPERTIES; COMPOSITE; MAGNETOTRANSPORT;

D O I：

10.1016/j.jallcom.2010.03.183

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Nanocrystalline, granular samples of La0.7Ca0.3MnO3 (LCMO) were synthesized by reactive milling method and annealed at various temperatures. Effect of grain size on the low-field magnetoresistance (LFMR) has been investigated. Based upon a phenomenological model taking into account the spin-polarized transport across grain boundaries, we explained magnetic field dependence of magnetoresistance in LCMO samples. The contribution to the magnetoresistance coming from spin-polarized tunneling was separated out from the intergranular contribution. The fitted results showed that the temperature dependence of the LFMR displays a Curie-Weiss law-like behavior. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：131 / 134

页数：4

共 21 条

[1] Magnetic surface effects and low-temperature magnetoresistance in manganese perovskites [J].

Balcells, LL ;

Fontcuberta, J ;

Martinez, B ;

Obradors, X .

JOURNAL OF PHYSICS-CONDENSED MATTER, 1998, 10 (08) :1883-1890

[2]

Dey P, 2006, PHYS REV B, V73, DOI 10.1103/PhysRevB.73.214425

[3] Improved magnetotransport in LCMO-Polymer (PPS) composite [J].

Gaur, Anurag ;

Varma, G. D. .

SOLID STATE COMMUNICATIONS, 2007, 144 (3-4) :138-143

[4] Enhanced low field magnetoresistance in La0.7Sr0.3MnO3/TiO2 composite [J].

Gaur, Anurag ;

Varma, G. D. ;

Singh, H. K. .

JOURNAL OF PHYSICS D-APPLIED PHYSICS, 2006, 39 (16) :3531-3535

[5] TUNNELING OF SPIN-POLARIZED ELECTRONS AND MAGNETORESISTANCE IN GRANULAR NI FILMS [J].

HELMAN, JS ;

ABELES, B .

PHYSICAL REVIEW LETTERS, 1976, 37 (21) :1429-1432

[6] Influence of the grain-size and oxygen stoichiometry on magnetic and transport properties of polycrystalline La0.67Ca0.33MnO3±δ perovskites [J].

Hueso, LE ;

Rivadulla, F ;

Sanchez, RD ;

Caeiro, D ;

Jardon, C ;

Vazquez-Vazquez, C ;

Rivas, J ;

Lopez-Quintela, MA .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1998, 189 (03) :321-328

[7] Spin-polarized intergrain tunneling in La-2/Sr-3(1)/3MnO3 [J].

Hwang, HY ;

Cheong, SW ;

Ong, NP ;

Batlogg, B .

PHYSICAL REVIEW LETTERS, 1996, 77 (10) :2041-2044

[8] Low field magneto-transport in LBSMO-PMMA composite [J].

Kumar, J ;

Singh, RK ;

Siwach, PK ;

Singh, HK ;

Singh, R ;

Srivastava, ON .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2006, 299 (01) :155-160

[9] Synthesis and low field transport properties in a ZnO-doped La0.67Ca0.33MnO3 composite [J].

Lei, LW ;

Fu, ZY ;

Zhang, JY ;

Wang, H .

MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY, 2006, 128 (1-3) :70-74

[10]

López-Quintela MA, 2003, NANOTECHNOLOGY, V14, P212, DOI 10.1088/0957-4484/14/2/322

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