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We present evidence of direct electron tunneling across intrinsic insulatingregions in sub-micrometer wide bridges of the phase separated ferromagnet(La,Pr,Ca)MnO$_3$. Upon cooling below the Curie temperature, a predominantlyferromagnetic supercooled state persists where tunneling across the intrinsictunnel barriers (ITBs) results in metastable, temperature-independent,high-resistance plateaus over a large range of temperatures. Upon applicationof a magnetic field, our data reveal that the ITBs are extinguished resultingin sharp, colossal, low-field resistance drops. Our results compare well totheoretical predictions of magnetic domain walls coinciding with the intrinsicinsulating phase.

Intrinsic tunneling in phase separated manganites