Nonlinear effects of current on transport in manganite films

Akilan Palanisami, M. B. Weissman, and N. D. Mathur
Phys. Rev. B 71, 094419 – Published 23 March 2005

Abstract

In films of La0.7Ca0.3MnO3 at current densities above about 104Acm2 a jump in resistance is found when the average sample temperature is just below the temperature of the maximum derivative of Ohmic resistance with respect to temperature. The jump is hysteretic as a function of current, temperature, and magnetic field. The existence of the jump is consistent with simulated effects of nonuniform Joule heating. Local thermometers based on noise features provide further evidence for the nonuniform heating. However, detailed comparison of the simulated Joule effects and the data show qualitative discrepancies, possibly due to strain-induced mixed-phase texture.

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  • Received 7 April 2004

DOI:https://doi.org/10.1103/PhysRevB.71.094419

©2005 American Physical Society

Authors & Affiliations

Akilan Palanisami1, M. B. Weissman1, and N. D. Mathur2

  • 1Department of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, Illinois 61801-3080, USA
  • 2Department of Materials Science, University of Cambridge, Cambridge CB2 3QZ, United Kingdom

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Issue

Vol. 71, Iss. 9 — 1 March 2005

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