Journal
PHYSICAL REVIEW LETTERS
Volume 84, Issue 2, Pages 310-313Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.310
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Recent scaling results for the ac conductivity of ionic glasses by Roling et al. [Phys. Rev. Lett. 78, 2160 (1997)] and Sidebottom [Phys. Rev. Lett. 82, 3653 (1999)] are discussed. We prove that Sidebottom's version of scaling is completely general. A new approximation to the universal ac conductivity arising in the extreme disorder limit of the symmetric hopping model, the diffusion cluster approximation, is presented and compared to computer simulations and experiments.
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