標題: Giant Hall effect in nonmagnetic Mo/SnO2 granular films
作者: Wu, Ya-Nan
Li, Zhi-Qing
Lin, Juhn-Jong
電子物理學系
物理研究所
Department of Electrophysics
Institute of Physics
公開日期: 17-Sep-2010
摘要: We have measured the resistivities and Hall coefficients, R-H, of a series of nonmagnetic Mo-x(SnO2)(1-x) nanogranular films with the Mo volume fraction x ranging from similar to 0.29 to 1. We found that the magnitude of R-H(2 K) largely increased by a factor of similar to 800 as x was reduced from similar to 0.8 to similar or equal to 0.36. Then, it slightly decreased with a further decrease in x down to similar or equal to 0.32, which was determined to be the classical percolation threshold, x(c), from the resistivity dependence on x. This nearly 3 orders of magnitude enhancement in R-H at a metal volume fraction x > x(c) is explained in terms of the recent theoretical concept of the local quantum-interference effect induced giant Hall effect in granular systems.
URI: http://dx.doi.org/10.1103/PhysRevB.82.092202
http://hdl.handle.net/11536/150034
ISSN: 1098-0121
DOI: 10.1103/PhysRevB.82.092202
期刊: PHYSICAL REVIEW B
Volume: 82
Issue: 9
起始頁: 0
結束頁: 0
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