Negative Magnetoresistance in the Nearest-neighbor Hopping Conduction

Details Negative Magnetoresistance in the Nearest-neighbor Hopping Conduction Negative Magnetoresistance in the Nearest-neighbor Hopping Conduction

1997-03-06

arxiv.org/abs/cond-mat/9703057v1

Physics

Condensed Matter

Latex file, no figure

Scientific paper

We propose a size effect which leads to the negative magnetoresistance in granular metal-insulator materials in which the hopping between two nearest neighbor clusters is the main transport mechanism. We show that the hopping probability increases with magnetic field. This is originated from the level crossing in a few-electron cluster. Thus, the overlap of electronic states of two neighboring clusters increases, and the negative magnetoresistance is resulted.

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