Observation of giant Hall effect in non-magnetic cermets

被引：13

作者：

Zhang, XX ^{[1
]}

Liu, H ^{[1
]}

Pakhomov, AB ^{[1
]}

机构：

[1] Hong Kong Univ Sci & Technol, Dept Phys, Kowloon, Hong Kong, Peoples R China

来源：

PHYSICA B | 2000年 / 279卷 / 1-3期

关键词：

granular films; giant Hall effect; non-magnetic cermet;

D O I：

10.1016/S0921-4526(99)00674-2

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We study the Hall coefficient over a wide temperature range in co-sputtered Cu:SiO2 samples with metal volume fraction in the range of 0.45 less than or equal to x less than or equal to 0.8. With decreasing metal volume fraction x, the samples change from metal to insulator and the Hall coefficient R increases drastically. A maximum has been observed at x = 0.51, which is similar to 700 times larger than that at x = 0.8. This enhancement far exceeds the factor of 20, which can be derived from the classical percolation (finite size scaling) theory. Based on these observations, we conclude that the non-magnetic GHE arises most probably from quantum interference effects on the mesoscopic scale. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：81 / 83

页数：3

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