Ferromagnetism and electrical transport in Fe-doped NiO

被引：55

作者：

Lin, Yuan-Hua

Wang, Jianfei

Cai, Jingnan

Ying, Minghao

Zhao, Rongjuan

Li, Ming

Nan, Ce-Wen ^{[1
]}

机构：

[1] Tsinghua Univ, Dept Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China

[2] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA

来源：

PHYSICAL REVIEW B | 2006年 / 73卷 / 19期

关键词：

D O I：

10.1103/PhysRevB.73.193308

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report Fe-doped NiO nanopowder, exhibiting room ferromagnetism mainly arising from the double exchange mechanism through the doped Fe ions and free charge carriers. Electrical measurements reveal that ac conductivity of the polycrystalline ceramics with Fe-doped NiO can be expressed as the sum of a frequency-independent conductivity sigma(1) and a frequency-dependent one sigma(2). The latter sigma(2) can be represented by the frequency dispersion for the dielectric loss due to the hopping diffusion of charge carriers with a single effective staying time tau similar to 6.11x10(-10) s at a lattice site.

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页数：4

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