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Giant Hall effect in nonmagnetic granular metal films
1Department of Physics and Institute of Nano Science & Technology, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China. phxxz@ust.hk
Physical Review Letters
|June 21, 2001
Abstract:
Nearly 3 orders of magnitude enhancement in the Hall coefficient is observed in Cu(x)-(SiO(2))(1--x) granular films. This large enhancement of the Hall coefficient not only is significantly larger than the prediction of the classical percolation theory, but also occurs at a metal concentration identified to be the quantum percolation threshold. Measurements of the electron dephasing length and magnetoresistance, plus the TEM characterization of microstructures, yield a physical picture consistent with the mechanism of the local quantum interference effect.