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Scaled frequency-dependent transport in the mesoscopically phase-separated colossal magnetoresistive manganite<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">La</mml:mi><mml:mrow><mml:mn>0.625</mml:mn><mml:mo>−</mml:mo><mml:mi>y</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">Pr</mml:mi><mml:mi>y</mml:mi></mml:msub><mml:msub><mml:mi mathvariant="normal">Ca</mml:mi><mml:mn>0.375</mml:mn></mml:msub><…
We address the issue of massive phase separation (PS) in the manganite family of doped Mott insulators through ac conductivity measurements on ${\mathrm{La}}_{0.625\ensuremath{-}y}{\mathrm{Pr}}_{y}{\mathrm{Ca}}_{0.375}\mathrm{Mn}{\mathrm{O}}_{3}$ $(0.375\ensuremath{\leqslant}y\ensuremath{\leqslant}0.275)$, and establish the applicability of the scaling theory of percolation in the critical regime of the PS. Measurements of dc resistivity, magnetization $[M(T)]$, and electron diffraction …