Giant Hall effect in nonmagnetic granular metal films.
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.
Zhang
X X
XX
Department 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
Wan
C
C
Liu
H
H
Li
Z Q
ZQ
Sheng
P
P
Lin
J J
JJ