Abstract
The real part of alternating current conductance Σ(T,f) of disordered systems shows nonOhmic behavior characterized by the existence of an onset frequency fc(T) below which Σ(T,f) retains its Ohmic value Σ0 but increases monotonically with frequency above fc(T). fc(T) scales with Σ0 as fc(T)∼Σ0(T,f)xf with xf as the nonlinearity exponent. By analyzing such experimental data of AC conductance varied by temperature and disorder on a wide variety of disordered systems, we show that xf has different values at different phases of a disordered system and can be used to identify the existence of different phases exhibited by such systems. Experimental results of nonOhmic conduction, existence of onset frequency fc(T), and the role of the onset exponent xf in identifying various phases of disordered systems are systematically analyzed within the framework of scaling formalism and explained with intra-chain conduction and tunneling between conducting grains separated by insulating regions.
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