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The ac conductivity () of three ionically conducting crystalline materials (NaClZn^2+, KTaO₃: Co^3+, H^+, and CeO₂: Gd^3+) and two glasses have been studied over an unusually wide temperature range. In all cases, limiting power-law behavior exponent s=1 in () =₀+A^s is observed at relatively low temperatures. It is concluded that this limiting behavior is a universal phenomenon. Available theoretical explanations have been examined and found to be unsatisfactory.
Lee et al. (Mon,) studied this question.