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We address the issue of massive phase separation (PS) in manganite family ofdoped Mott insulators through ac conductivity measurements onLa$_{0.625-y}$Pr$_{y}$Ca$_{0.375}$MnO$_{3}$ (0.375 $\leq$ y $\leq$ 0.275), andestablish applicability of the scaling theory of percolation in the criticalregime of the PS. Measurements of dc resistivity, magnetization (M(T)) andelectron diffraction show incomplete growth of a ferromagnetic (FM) metalliccomponent on cooling the high temperature charge ordered (CO) phase well belowCurie temperature. The impedance $\mid$Z(T,f)$\mid$ measured over a frequency(f) range of 10 Hz to 10 MHz in the critical regime follows a universal scalingof the form $\approx$ R(T,0)g(f$\xi^{2+\theta}$) with $\theta$ $\approx$ 0.86and the normalized correlation length varying from 1 to 4, suggesting anomalousdiffusion of holes in percolating FM clusters.

Scaled frequency-dependent transport in the mesoscopically phase-separated colossal magnetoresistive manganite La_{0.625-y}Pr_yCa_{0.375}MnO_3