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

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.

  • Figure
  • Figure
  • Figure
  • Figure
  • Received 7 May 2008

DOI:https://doi.org/10.1103/PhysRevLett.102.077205

©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. afh@phys.ufl.edu

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 102, Iss. 7 — 20 February 2009

Reuse & Permissions
Access Options
Collection
Heating up of Superconductors
January 27, 2017

This collection marks the 30th anniversary of the discovery of high-temperature superconductors. The papers selected highlight some of the advances that have been made to date, both in understanding why these compounds behave in the way they do, and in utilizing them in applications. The papers included in the collection have been made free to read.

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review Letters

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×