1/f noise through the metal–nonmetal transition in percolating composites
نویسندگان
چکیده
We have measured the 1/f noise through the metal–nonmetal transition in carbon black/polymer composites as a function of temperature and doping. At the electronic transition, the resistivity power spectrum Sr varies as Sr;r , with Q52.77, in agreement with classical three-dimensional percolation. At lower temperatures, a crossover to tunneling-dominated transport occurs with Sr ;ln Sr /r . Our results show that 1/f noise can be a more sensitive technique than resistivity itself for probing transport behavior near a percolation-induced electronic transition. © 2000 American Institute of Physics. @S0003-6951~00!02505-5#
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