Grain-boundary magnetoresistance in manganites: Spin-polarized inelastic tunneling through a spin-glass-like barrier

被引：104

作者：

Ziese, M ^{[1
]}

机构：

[1] Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire, England

来源：

PHYSICAL REVIEW B | 1999年 / 60卷 / 02期

关键词：

D O I：

10.1103/PhysRevB.60.R738

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The grain-boundary magnetoresistance of various La0.7Ca0.3MnO3 samples was investigated by resistance, magnetoresistance, and dynamic conductance measurements. Data on five samples, namely an epitaxial film, a polycrystalline film, a step-edge array, a mechanically induced grain boundary, and a chromium-manganite tunneling contact, are presented. A model of spin-polarized inelastic tunneling through an insulating barrier with spin-glass-like characteristics is proposed that explains the experimental observations.

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页码：R738 / R741

页数：4

相关论文

共 16 条

[1] High-field magnetoresistance at interfaces in manganese perovskites [J].

Balcells, L ;

Fontcuberta, J ;

Martínez, B ;

Obradors, X .

PHYSICAL REVIEW B, 1998, 58 (22) :14697-14700

[2] Conduction mechanisms in c-axis oriented YBCO based trilayer junctions with ferromagnetic A(0.7)B(0.3)MnO(3) manganite barriers [J].

Bari, MA ;

Cabeza, O ;

Capogna, L ;

Woodall, P ;

Muirhead, CM ;

Blamire, MG .

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 1997, 7 (02) :2304-2307

[3] Magnetic localization and magnetoresistance in mixed-valence manganites and related ferromagnetic oxides [J].

Coey, JMD .

PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 1998, 356 (1742) :1519-1539

[4] 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

[5]

GLAZMAN LI, 1988, ZH EKSP TEOR FIZ, V67, P1276

[6] Spin-flip scattering in magnetic junctions [J].

Guinea, F .

PHYSICAL REVIEW B, 1998, 58 (14) :9212-9216

[7] 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

[8] 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

[9] TUNNELING BETWEEN FERROMAGNETIC-FILMS [J].

JULLIERE, M .

PHYSICS LETTERS A, 1975, 54 (03) :225-226

[10] Transport across conducting ferromagnetic oxide metal interfaces [J].

Mieville, L ;

Worledge, D ;

Geballe, TH ;

Contreras, R ;

Char, K .

APPLIED PHYSICS LETTERS, 1998, 73 (12) :1736-1738