Enhanced magnetoresistance in sintered granular manganite/insulator systems

被引：207

作者：

Petrov, DK ^{[1
]}

Krusin-Elbaum, L ^{[1
]}

Sun, JZ ^{[1
]}

Feild, C ^{[1
]}

Duncombe, PR ^{[1
]}

机构：

[1] IBM Corp, Thomas J Watson Res Ctr, Yorktown Heights, NY 10598 USA

来源：

APPLIED PHYSICS LETTERS | 1999年 / 75卷 / 07期

关键词：

D O I：

10.1063/1.124577

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report significant enhancements of magnetoresistance in granular (La0.67Ca0.33MnO3)(x)/(SrTiO3)(1-x). The system exhibits a conduction threshold at x=x(c)similar to 60%, around which magnetoresistance versus x has a maximum. The composition x(c) at which maximum enhancement in magnetoresistance is observed is the same at high (around 5 T) and at low (a few hundred Oersted) fields. The enhancement is consistent with the disorder-driven amplification of spin-dependent transport at the structural boundaries of the mixture. (C) 1999 American Institute of Physics. [S0003-6951(99)00533-1].

引用

页码：995 / 997

页数：3

共 20 条

[1] Atomic-level engineering of cuprates and manganites [J].

Bozovic, I ;

Eckstein, JN .

APPLIED SURFACE SCIENCE, 1997, 113 :189-197

[2] Magnetoresistance of chromium dioxide powder compacts [J].

Coey, JMD ;

Berkowitz, AE ;

Balcells, L ;

Putris, FF ;

Barry, A .

PHYSICAL REVIEW LETTERS, 1998, 80 (17) :3815-3818

[3] Defect-induced spin disorder and magnetoresistance in single-crystal and polycrystal rare-earth manganite thin films [J].

Evetts, JE ;

Blamire, MG ;

Mathur, ND ;

Isaac, SP ;

Teo, BS ;

Cohen, LF ;

Macmanus-Driscoll, JL .

PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 1998, 356 (1742) :1593-1613

[4] Colossal magnetoresistance of ferromagnetic manganites: Structural tuning and mechanisms [J].

Fontcuberta, J ;

Martinez, B ;

Seffar, A ;

Pinol, S ;

GarciaMunoz, JL ;

Obradors, X .

PHYSICAL REVIEW LETTERS, 1996, 76 (07) :1122-1125

[5] Grain-boundary effects on the magnetoresistance properties of perovskite manganite films [J].

Gupta, A ;

Gong, GQ ;

Xiao, G ;

Duncombe, PR ;

Lecoeur, P ;

Trouilloud, P ;

Wang, YY ;

Dravid, VP ;

Sun, JZ .

PHYSICAL REVIEW B, 1996, 54 (22) :15629-15632

[6] 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

[7] THOUSANDFOLD CHANGE IN RESISTIVITY IN MAGNETORESISTIVE LA-CA-MN-O FILMS [J].

JIN, S ;

TIEFEL, TH ;

MCCORMACK, M ;

FASTNACHT, RA ;

RAMESH, R ;

CHEN, LH .

SCIENCE, 1994, 264 (5157) :413-415

[8] Large low-field magnetoresistance in La0.7Ca0.3MnO3 induced by artificial grain boundaries [J].

Mathur, ND ;

Burnell, G ;

Isaac, SP ;

Jackson, TJ ;

Teo, BS ;

MacManusDriscoll, JL ;

Cohen, LF ;

Evetts, JE ;

Blamire, MG .

NATURE, 1997, 387 (6630) :266-268

[9] Spin-dependent electronic transport in granular ferromagnets [J].

Milner, A ;

Gerber, A ;

Groisman, B ;

Karpovsky, M ;

Gladkikh, A .

PHYSICAL REVIEW LETTERS, 1996, 76 (03) :475-478

[10] LARGE MAGNETORESISTANCE AT ROOM-TEMPERATURE IN FERROMAGNETIC THIN-FILM TUNNEL-JUNCTIONS [J].

MOODERA, JS ;

KINDER, LR ;

WONG, TM ;

MESERVEY, R .

PHYSICAL REVIEW LETTERS, 1995, 74 (16) :3273-3276

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