Abstract
Impedance and ac conductivity studies on parent Y–Ba–Cu–O and Na-, K-doped Tc-enhanced and other superconductors indicate that either the mechanism of ac conductivity or nature of charge carriers or both in the Na-, K-doped Y–Ba–Cu–O differ from the parent Y–Ba–Cu–O and other superconductors. This is indicated by the random walk type (RWT) model curve fittings.
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