First-order metal-insulator transition and spin-polarized tunneling in Fe3O4 nanocrystals -: art. no. 172405

被引：119

作者：

Poddar, P ^{[1
]}

Fried, T ^{[1
]}

Markovich, G ^{[1
]}

机构：

[1] Tel Aviv Univ, Sch Chem, IL-69978 Tel Aviv, Israel

来源：

PHYSICAL REVIEW B | 2002年 / 65卷 / 17期

关键词：

D O I：

10.1103/PhysRevB.65.172405

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Tunneling junctions of stacked monolayers of uniform, organically functionalized Fe3O4 nanocrystals of 5.5 nm average diameter were prepared. Current-voltage characteristics of the junctions were studied as function of temperature and magnetic field. An abrupt increase in the resistance was observed on cooling below 96 K. This is attributed to the Verwey metal-insulator transition in the nanocrystals. Above 96 K, the I-V curves reflect the density of states of the narrow conduction band. This conductance peak is sensitive to the external magnetic field and exhibits large magnetoresistance.

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页码：1 / 4

页数：4

相关论文

共 35 条

[1] Spin-dependent tunneling in self-assembled cobalt-nanocrystal superlattices [J].

Black, CT ;

Murray, CB ;

Sandstrom, RL ;

Sun, SH .

SCIENCE, 2000, 290 (5494) :1131-1134

[2] Magnetoresistance of magnetite [J].

Coey, JMD ;

Berkowitz, AE ;

Balcells, L ;

Putris, FF ;

Parker, FT .

APPLIED PHYSICS LETTERS, 1998, 72 (06) :734-736

[3]

Fried T, 2001, ADV MATER, V13, P1158, DOI 10.1002/1521-4095(200108)13:15<1158::AID-ADMA1158>3.0.CO

[4]

2-6

[5] Absence of charge ordering below the Verwey transition temperature in magnetite -: art. no. 054110 [J].

García, J ;

Subías, G ;

Proietti, MG ;

Blasco, J ;

Renevier, H ;

Hodeau, JL ;

Joly, Y .

PHYSICAL REVIEW B, 2001, 63 (05)

[6] Evidence for the Verwey transition in highly nonstoichiometric nanometric Fe-based ferrites [J].

Guigue-Millot, N ;

Keller, N ;

Perriat, P .

PHYSICAL REVIEW B, 2001, 64 (01) :124021-124024

[7] Spin-polarized transport and magnetoresistance in magnetic oxides [J].

Gupta, A ;

Sun, JZ .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1999, 200 (1-3) :24-43

[8] STRUCTURE OF MAGNETITE (FE3O4) BELOW THE VERWEY TRANSITION-TEMPERATURE [J].

IIZUMI, M ;

KOETZLE, TF ;

SHIRANE, G ;

CHIKAZUMI, S ;

MATSUI, M ;

TODO, S .

ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE, 1982, 38 (AUG) :2121-2133

[9] Activation volumes for solid-solid transformations in nanocrystals [J].

Jacobs, K ;

Zaziski, D ;

Scher, EC ;

Herhold, AB ;

Alivisatos, AP .

SCIENCE, 2001, 293 (5536) :1803-1806

[10] MAGNETIC AFTEREFFECTS IN MAGNETITE [J].

KRONMULLER, H ;

SCHUTZENAUER, R ;

WALZ, F .

PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE, 1974, 24 (02) :487-494

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