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Title: Temperature and magnetic field dependent transports in granular structures
Authors: Cheung, H. Y.
Ng, Tai-Kai
Hui, P. M.
Keywords: Nanomaterials
Granular structures
Temperatured dependent transports
Magnetic field dependent transport
Issue Date: 2001
Citation: Nano Science and Technology : Novel Structures and Phenomena, 2nd Croucher ASI on Nano Science and Technology, HKUST, Hong Kong. Taylor and Francis, 2003. p. 220-223
Abstract: We study the temperature and magnetic field dependent transports of a two-dimensional granular system near percolation threshold. We consider a model system that consists of ferromagnetic, metallic nano-sized particles randomly distributed on a 2D non-magnetic and insulating surface. The particles (grains) do not touch one another, but electrons can quantum tunnel from one grain to another. We assume a temperature range where phonon-assisted hopping is not important and quantum tunneling dominates the transports between the particles. However, the temperature is still high enough so that the phase coherence between different tunneling events is lost. In this case the whole system can be treated as a classical percolation network with resistance between gains determined by quantum tunneling. Spin-dependent scattering is also considered in our system.
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