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Updated: Jun 25, 2026

Fabrication of Spatially Confined Complex Oxides
Published on: July 1, 2013
Intrinsic tunneling in phase separated manganites
G Singh-Bhalla1, S Selcuk, T Dhakal
1Department of Physics, University of Florida, Gainesville, Florida 32611, USA.
Abstract:
We present evidence of direct electron tunneling across intrinsic insulating regions in submicrometer wide bridges of the phase-separated ferromagnet (La,Pr,Ca)MnO3. Upon cooling below the Curie temperature, a predominantly ferromagnetic supercooled state persists where tunneling across the intrinsic tunnel barriers (ITBs) results in metastable, temperature-independent, high-resistance plateaus over a large range of temperatures. Upon application of a magnetic field, our data reveal that the ITBs are extinguished resulting in sharp, colossal, low-field resistance drops. Our results compare well to theoretical predictions of magnetic domain walls coinciding with the intrinsic insulating phase.
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