Electric-field-induced melting of the randomly pinned charge-ordered states of rare-earth manganates and associated effects

C. N. R. Rao, A. R. Raju, V. Ponnambalam, Sachin Parashar, and N. Kumar
Phys. Rev. B 61, 594 – Published 1 January 2000
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Abstract

Films of charge-ordered Nd0.5Ca0.5MnO3, Gd0.5Ca0.5MnO3, Y0.5Ca0.5MnO3, and Nd0.5Sr0.5MnO3 show insulator-metal transitions on the passage of small electrical currents. That such an electric-field-induced transition occurs even in Y0.5Ca0.5MnO3 where the charge-ordered state is not affected by magnetic fields is noteworthy. The transition is attributed to the depinning of the randomly pinned charge solid. These materials also exhibit an interesting memory effect probably due to the randomness of the strength as well as the position of the pinning centers.

  • Received 30 November 1998

DOI:https://doi.org/10.1103/PhysRevB.61.594

©2000 American Physical Society

Authors & Affiliations

C. N. R. Rao*, A. R. Raju, V. Ponnambalam, and Sachin Parashar

  • Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore 560 064, India

N. Kumar

  • Raman Research Institute, Bangalore 560 080, India

  • *Electronic address: cnrrao@jncasr.ac.in

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Vol. 61, Iss. 1 — 1 January 2000

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