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
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