Intrinsic Tunneling in Phase Separated Manganites

G. Singh-Bhalla, S. Selcuk, T. Dhakal, A. Biswas, and A. F. Hebard
Phys. Rev. Lett. 102, 077205 – Published 20 February 2009


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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  • Received 7 May 2008


©2009 American Physical Society

Authors & Affiliations

G. Singh-Bhalla, S. Selcuk, T. Dhakal, A. Biswas, and A. F. Hebard*

  • Department of Physics, University of Florida, Gainesville, Florida 32611, USA

  • *Corresponding author.

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Vol. 102, Iss. 7 — 20 February 2009

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