Nonlinear current-voltage characteristics of oxygen-deficient La 0.67Ca0.33MnO3-y films

S. J. Liu*, J. Y. Juang, J. Y. Lin, K. H. Wu, T. M. Uen, Y. S. Gou

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Two different types of nonlinear current-voltage characteristics are observed in oxygen-deficient La0.67 Ca0.33 MnO3-y (LCMO) films at temperatures below the insulator-metal transition. The paraboliclike dynamic conductance G (V), defined as dI / dV, curves near the zero bias observed in highly oxygen-deficient LCMO films implies the contribution from the spin-dependent tunneling transport between ferromagnetic clusters, with magnetic-disordered regions serving as tunneling barriers. On the other hand, for the slightly oxygen-deficient LCMO films, dips around the zero bias were observed in nonlinear G (V) curves and have been attributed to spin-flip scattering, with oxygen vacancies serving as scattering centers.

Original languageEnglish
Article number023917
JournalJournal of Applied Physics
Issue number2
Publication statusPublished - 2008
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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